OK anotjer question ican kairos reinforce an hell cannon so it overlap two disk band deal this way impact damage on both?

The impact damage would not be dealt. on page 21 under keywords impact reads: A disk with impact deals physical damage equal to its impact value to each disk it pins after a flip... so impact only works while the disk is moving and would not trigger on being placed through reinforcement.

Edit: the impact entry in the keywords also goes onto say: Impact damage is not applied when a disk is deployed or reinforced pinning another disk...

So unfortunately for chaos players (and a great boon to every one else) the rule book is very clear on this matter.