It's a long story, Read the WR. and Portrait of an Assassin.
Just because he adhered to a lone nut theory it does not make him an "inside man".
What would be the point in removing those fragments?
Those fragments, along with CE 399 ( including the two fragments found in the limo), when weighed and added together, would end up with a weight far greater than one bullet.
Those fragments would have told us whether they came from CE-399 thru laser ablation. That would positively link the fragments to CE-399 or not. I suspect not because CE-399 was obviously shot into a swimming pool then retrieved before being planted on the wrong gurney and became the Impossible Pristine Magic Bullet.
Why are you including fragments found in the limo? They never came from CE 399. The fragments deposited in Connally came from CE 399. The total mass of the six fragments deposited in Connally comes no where near to exceeding the mass missing from CE 399.