Johnson on his best day couldn't look as good as Barker did against USM. So barker has the higher ceiling.
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This reasoning is utter nonsense, and you have nothing to base it on other than speculation. You have no idea what Johnson's "best day" is. And I dare say Johnson has arguably ALREADY looked better than Barker against USM in the one and only game he's gotten real playing time.
Thinking Barker should start is a fair opinion. But these reasons posters like you are making up to support that view ("far higher" ceiling, serious accuracy problems, etc.) are just absurd considering you've no real evidence to base it on. You're basically just making up guesses.
The only thing we truly know about Johnson right now is what he did Saturday. And Saturday there was nothing to suggest he had accuracy problems--instead he threw the ball extremely well. And there was nothing indicating he had a lower ceiling than Barker (to the contrary, you could argue he showed a higher ceiling considering he plainly has vastly superior running ability in addition to throwing the ball well).
That said, I acknowledge it was against a crappy NMSU defense, and he may very likely end up sucking against better competition. But right now NMSU is all we have to judge him on, and there was absolutely nothing in that game to support some of these statements being made about him in this thread.