hi, mega noob question. FOR SAY... i had this

1. mesa triaxis pre amp
2. mesa rectifier pre amp
3. marshall jmp-1 pre amp
4. mesa 2:100 power amp

can i power all 3 pre amps with 1 power amp?
I don't know much about this but I'm pretty sure it will work
2 pre-amps would be easy since it's a stereo power amp, however if you want more than that you will need either a switch or a line mixer.
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LzR Engineering 212 cab

My other amp can run Crysis

I'm presuming your going with a Midi setup, so a decent Midi controlled switching system should get your signal routing to the preamps well situated. If not, consider the Voodoo Lab Amp Selector or the Lehle 1@3.
ESP LTD EC-256 and a Fender Deluxe VM