It's still early, but so far it appears the ole adage is true. If you have 2 starting qbs, you have none.
From past scenarios, they need to get that sorted out or it will sink them.
FWIW, personally, I don't think Cardale is a full time starter. I've said from the outset he should have gone pro after last year when he was projected as a top 5 draft pick. I think he's kind of shown that the first couple of games. He played very well at the end of the year with an insane offensive line and polished receivers. Now that it's the beginning of the year and everyone is trying to settle in again, he can't control it. He basically got to step into JT's team and run it for the time being. I don't think the team works very well as his.
Something I didn't think about before though, which is probably why he got the start, is that he took basically every first team snap in the spring with JT hurt. I think now that he's shown what he has, that JT should start moving forward.