While I disagree with the 70-30 percent, the rest seems fairly likely to open the season. With our unproven OL, questionable LT, the offense has to be based on quick passes rather than long developing plays. The other option is keeping a TE back for blocking which hampers the passing options.
If our OL surprises us or gets better during the season, then we may see longer pass completions. But as it stands right now, the only QB on our roster who can make quick decisions and does not need to have a great deep ball (per above argument) is TE and logically that makes him the starter.
Ofcourse this is not an ideal situation (unproven OL, starting QB by default etc) but we have to make do with what we have (duh!). Presumably we fixed the D this year, next year is the one for the O.