Run Rear speakers off amp or head-unit

Here is my updated system:

430 RBZ

Alpine KTP-445 4 Channel

AudioControl LC2i

4) KICKER 6.5 Upgrade

2) OEM 3.5 Alpine Speakers - dash

2) OEM 3.5 Sound Bar

KICKER Hideaway goes in next week.

Sounds really nice and I am happy. Now should I take the rear speakers off the Alpine go just run through the head unit to regain some fade control?

Go go with a LC7i and reagin it this way and keep more power and cleaner sound to rear speakers?