I dunno, I've experienced this a lot, although to be fair, with much larger areas of expertise than a particular product. I was thinking more about 'graphics', 'AI' or at the language level like 'C' or 'Java'.
I'll trust my experience over guesswork.
I've worked with guys that have done nothing other than Spring and Hibernate for nearly a decade and they know those platforms inside and out. There's just no way someone junior with a few hobby projects are running rings around those guys in their areas.
However, if you take something new, or something these guys haven't used, then yea.... rings could be run. Other than that, I don't think so.