First of all, where is he being quoted? I just see Blair writing "Ricciardi envisions Molina catching 5 times a week." If Ricciardi actually said something like that, wouldn't he have written it as a direct quote coming straight from Ricciardi? He could be just assuming that is the case due to the $3 million deal, and $1.5 million signing bonus. This is probably true, considering Blair is the only Toronto reported to have written it this way.
Second of all, even if Ricciardi actually told Blair this in some kind of interview between the two of them, and he isn't just assuming, J.P. doesn't make the lineup decisions, Gibbons does. They are already differing on a few points earlier this year, specifically where Vernon Wells will bat (Gibbons sees him more as a 5, J.P. sees him as a 3).
In addition, Molina will also start several games as a DH agaisnt tougher LH pitchers, leaving Zaun to catch on those days. Zaun is also the better hitter agaisnt RH pitchers, so one would assume that he would start many of those games as well.
At the moment, I'm expecting the playing time to be divied up between the two of them at a 60-40 or 70-30 rate in favour of Molina. You are right, he will be the "primary starter", but it won't be to the same extent as a Posada/Varitek/Martinez would be. I highly doubt he'll catch anywhere near the number of games Zaun did last year.
We've been at this long enough to know that I won't be changing my stance anytime soon, so the best thing we can do now is wait it out until April. It is then, that you will see I am correct in my assessment of the current Jays catching situation.