Number of contents created by a user in a organic group
If you are happy to use the rules module or the user points module, this is relatively simple. I don't think it's possible using only views.

I would add an integer field to User and have a rule

Event: After Saving New Content
Condition: Entity is of type &gt; Content Type B
Action: Calculate a value &gt; Input 1 = site:current user:field / Operator + / Input 2 = 1


Then display that field in your view. 

User points is another option but is unnecessary if you already use rules.