speaker arrangement?

2004 chevy silverado ex cab.  Front door, Memphis MClass 6.5 component and in rear door, Memphis MultiSync components 5 1/4.  I just purchased a set of kick panels and would like to put the 5 1/4's in the kick panel.  Would I still need to put something in the rear door to keep the staging correct??  Maybe just a regular 4x6??  Or should I have all the mids and highs from the front and subs from the rear.  I have 2 Memphis M3's 12" subs under the rear seat with a Memphis 1000d pushing them.  BTW, a Memphis 75x4 Mclass amp is pushing the components.

I guess what I am asking is if I take my 5 1/4's out of my rear door and put them in the kick, I will have no speakers in the rear door.  Will this affect staging, and do I need to put something in the rear door.  Also, if I need something in the rear door, how will I wire the speakers into the amp.  If I tie two sets together, won't it affect the ohm's??  Could I run the rear 4x6 (if I put them in) off my deck (Alpine IVA-D300)??

Thanks

No, I have the 6.5's in the stock location in the door, and I just picked up some kick panels for my truck to put the 5 1/4's in.  So I will have 6.5 in the door and 5 1/4 in the kick panel.  Should I put some speakers in my rear door to replace the 5 1/4's or just leave them out.  Do you thing the two components up front will give me plenty of sound??

Thanks for the reply