I did not find answers in the FAQ.
1- if a summons do a element, can the owner of the summons use it right after summon's turn? (normaly you can use the element from someone else's turn)
2- If i can bless adjacent allies,can i bless a group of summons from someone else? this could result in adding a few X2 card in his deck
1. Yes. The restriction is only that you can't consume an element that you yourself have infused on the same turn
2. Yes, allies are allies.