> One last question sorry if I'm being annoying but can Summoner make contracts with more one type of ExBeast?

No problem, it's not annoying at all. Yes, they can make contracts with more than one type of ExBeast. Each individual Contract takes up a Spell slot, so at the beginning you could have up to three level 1 Summons or adjust the levels as you wish using those 3 skill/spell points.