The Jays (somewhat) depleted prospect pool is not a surprise.
Look at how many prospects they've graduated and traded over the last 5 seasons.
And the funny thing is, the ones they've graduated have turned into decent to great MLB contributors, while I've yet to see any of the ones they traded provide anything of value at the MLB level yet. Of course, the jury is still out on a few of them, Moreno especially, but I'd say the Jays FO has done a great job of keeping the keepers and trading the rest for actual MLB talent.