It might have been Kennedy and the whole group deciding on the strategy, but yes, it is my opinion, it was a team strategy, pan or guideline- whatever you want to call it.
Not trading any top prospects for over 5 years is not total proof such a plan or mandate existed. I get that, but it certainly is evidence such a plan might have existed. It's also entirely possible they hired Bloom, because they knew he was the type of GM that would willingly go along with that strategy, as that as basically the strategy TB has used for many years, including the many years Bloom was there. Hiring Bloom is more evidence the plan was started before he got here. The no trades by DD for over a year is added proof. If you don't count Beeks as a top prospect, DD went 2 years with no major prospect trades, and we are now at over 6 years with none made.
Saying the choice was made from above, does not mean Bloom was fighting the plan all along and wanted to trade top prospects. There is a chance they said, at some point, if you see a great trade opportunity using top prospects, you can make it, and he never found one, Certainly, that could be the case. That is one reason my position is just an opinion or theory. Knowing Bloom's history with TB, that could have been the case.
I found it a bit telling that the stories leaked about trades not made, mostly seemed to be on trading top players for prospects and not the other way around. It's like management admitting they wished he had made more stars for prospects trades than vice versa.
Again, just my opinion based on an educated guess- not a stab in the dark.
.