No idea if he was calling plays (doubt it), but the offenses under Wells at both USU and TT were both, on the whole, pretty underwhelming. He had one truly great year at USU (his last), but several years of mediocre/bad offenses from a scoring standpoint (including one in which they were 107th in scoring).
This is a completely meh hire, but it could have been worse (see The Mess).