It would be hard to judge, since he did bobble vocally on YTOTIW and it's not like we saw any substantive acting out of anyone on the show, but then again, TV viewers saw only a tiny portion of what went on and the show was so stupidly structured that it was difficult to measure skill in anything.
Since Keeling was Danny Zuko on tour with "Grease," there is some benefit of the doubt factor.
'"Contrairiwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."'
~Lewis Carroll