in my opinion Edo Deidara works better with Shark Kisame because of his chakra regen (easier way to cast Deidara's mystery early) whenever a unit/clone dies which also gives Edo Deidara a crit rate boost ( -> his spiders and Kisame's little sharks)

I would say 5 Kage Madara since his ability to clear all buffs on the field really helps with supporting Edo Deidara who might get blitzed by Kushimaru or pos 1 LM teams. Chakra gain isn’t an issue as well since Madara can steal 20 with his chase which can be triggered twice each round. I’ve seen him work really well with Jonin Minato too when his bond mystery comes out.