Whether or not he is suitable is a co-founder doesn't seem to be the issue. The issue is, is he a suitable co-founder for you? Judging by the way you have phr

Whether or not he is suitable is a co-founder doesn't seem to be the issue. The issue is, is he a suitable co-founder for you? Judging by the way you have phrased everything, I would say he's not a good match for you.