Impdp LOB in parallel mode

I am using Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit. I am importing LOBS with parallel option but my status shows import is not hapennig in parallel - mode. I have only 1 worker with Worker Parallelism: 1.
Import> status
Job: SYS_IMPORT_TABLE_01
Operation: IMPORT
Mode: TABLE
State: EXECUTING
Bytes Processed: 0
Current Parallelism: 16
Job Error Count: 0
Dump File: /admin/data_pump/lob_tame_%u.dmp
Dump File: /admin/data_pump/lob_tame_01.dmp
Dump File: /admin/data_pump/lob_tame_02.dmp
Dump File: /admin/data_pump/lob_tame_03.dmp
Dump File: /admin/data_pump/lob_tame_04.dmp
Dump File: /admin/data_pump/lob_tame_05.dmp
Dump File: /admin/data_pump/lob_tame_06.dmp
Dump File: /admin/data_pump/lob_tame_07.dmp
Worker 1 Status:
State: EXECUTING
Object Schema: MAIN
Object Name: LOB_TABLE
Object Type: TABLE_EXPORT/TABLE/TABLE_DATA
Completed Objects: 1
Completed Rows: 4,798
Completed Bytes: 28,255,491,864
Percent Done: 100
Worker Parallelism: 1
Import>
My database sever has 8 cpu. My import command is
impdp main@database directory=data_pump_dir dumpfile=lob_table_%U.dmp remap_schema=dev:main tables=LOB_table content=data_only TABLE_EXISTS_ACTION=TRUNCATE parallel=16.
Please let me know why my import is not hapenning in parallel mode?
I appriciate any input . Thanks for reading.

Thank you DBMS Direct . I tried changing the parallelism to 7 but it did not help. Please let me know of any other suggsestion..

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NAME                                 TYPE        VALUE
fast_start_parallel_rollback         string      FALSE
parallel_adaptive_multi_user         boolean     TRUE
parallel_automatic_tuning            boolean     FALSE
parallel_degree_limit                string      CPU
parallel_degree_policy               string      MANUAL
parallel_execution_message_size      integer     16384
parallel_force_local                 boolean     FALSE
parallel_instance_group              string
parallel_io_cap_enabled              boolean     FALSE
parallel_max_servers                 integer     8
parallel_min_percent                 integer     0
NAME                                 TYPE        VALUE
parallel_min_servers                 integer     0
parallel_min_time_threshold          string      AUTO
parallel_server                      boolean     FALSE
parallel_server_instances            integer     1
parallel_servers_target              integer     64
parallel_threads_per_cpu             integer     2
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| Id | Operation          | Name    | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |         | 1000K|    12M| 1058 (12)| 00:00:06 |
|   1 | HASH GROUP BY     |         | 1000K|    12M| 1058 (12)| 00:00:06 |
|   2 |   TABLE ACCESS FULL| RJ_TEST | 1000K|    12M|   962   (3)| 00:00:05 |
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SQL> select * from table(dbms_xplan.display);
SQL> set lines 120
SQL> set pages 1000
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| Id | Operation                | Name     | Rows | Bytes | Cost (%CPU)| Time     |    TQ |IN-OUT| PQ Distrib |
|   0 | SELECT STATEMENT         |          | 1000K|    12M|   145 (11)| 00:00:01 |        |      |            |
|   1 | PX COORDINATOR          |          |       |       |            |          |        |      |            |
|   2 |   PX SEND QC (RANDOM)    | :TQ10001 | 1000K|    12M|   145 (11)| 00:00:01 | Q1,01 | P->S | QC (RAND) |
|   3 |    HASH GROUP BY         |          | 1000K|    12M|   145 (11)| 00:00:01 | Q1,01 | PCWP |            |
|   4 |     PX RECEIVE           |          | 1000K|    12M|   145 (11)| 00:00:01 | Q1,01 | PCWP |            |
|   5 |      PX SEND HASH        | :TQ10000 | 1000K|    12M|   145 (11)| 00:00:01 | Q1,00 | P->P | HASH       |
|   6 |       HASH GROUP BY      |          | 1000K|    12M|   145 (11)| 00:00:01 | Q1,00 | PCWP |            |
|   7 |        PX BLOCK ITERATOR |          | 1000K|    12M|   133   (3)| 00:00:01 | Q1,00 | PCWC |            |
|   8 |         TABLE ACCESS FULL| RJ_TEST | 1000K|    12M|   133   (3)| 00:00:01 | Q1,00 | PCWP |            |
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NAME                                 TYPE        VALUE
fast_start_parallel_rollback         string      LOW
parallel_adaptive_multi_user         boolean     TRUE
parallel_automatic_tuning            boolean     FALSE
parallel_degree_limit                string      CPU
parallel_degree_policy               string      MANUAL
parallel_execution_message_size      integer     16384
parallel_force_local                 boolean     FALSE
parallel_instance_group              string
parallel_io_cap_enabled              boolean     FALSE
parallel_max_servers                 integer     16
parallel_min_percent                 integer     0
parallel_min_servers                 integer     1
parallel_min_time_threshold          string      AUTO
parallel_server                      boolean     FALSE
parallel_server_instances            integer     1
parallel_servers_target              integer     16
parallel_threads_per_cpu             integer     2
recovery_parallelism                 integer     0
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