First on the ND-Mich Play - By the letter of the law, since there is no team A eligible receiver in the area, we could throw IG, however, as was pointed out, it the pass is caught (by B), we do not throw IG.
If a Team A lineman catches the pass and there is no team A eligible in the area, then it is ONLY IG, not illegal touching, since illegal touching requires a legal forward pass.
7-3-2-h, 7-3-11