You better be considered to have a Top 5 prospect pool if you give away nearly all of your real NHL players of value for picks/prospects and then never trade picks or prospects for pretty much five years while routinely drafting high in the draft because the NHL team sucks so much.
The comment is regarding the development part of that B+ grade. That's probably an A+ after last year's draft from so many that were crowning Blake's "unbelievable turnaround of the worst prospect pool into the best prospect pool" but now we are sitting here with a lot of question marks but the grade is still a B+. The results so far say that they actually suck at drafting or they suck at development: combining the two in to one grade is generous to Management.
Let's do one more summer of me having to remind everyone that Lombardi turned what was considered a shit pipeline into what was considered a Top 5 prospect pool for a few seasons as well. That Top 5 ranking was not supported by Kopitar because he immediately graduated and it only had Doughty in it for one ranking as well. Even if you want to include them, Blake has also had a 2, 5 and 8OA to support his pool rankings. Lombardi had Hickey/Bernier/Lewis/Teubert at the forefront of a pool that was Top 5. You shit all over NHL ice to pick high in the draft while also accumulating more prospects and high picks, well, you're going to get a Top 5 ranking just by taking whoever the CSB or Bobby Mac have as the BPA when you draft.
I'm not saying these guys are write-offs at all. Lombardi wound up with guys like Martinez and Dwight King that didn't move the needle for the rankings and Blake will have some of that as well with Spence and others; however, you'd really like to see more out of the majority of the prospect pool: especially the 1st round picks. Due to the performance of the "Blake is a magician!!!" prospect pool to date, it is extremely fair to wonder why a fan would grade them as a B+ for drafting and development.