Yeah, that's totally fair. I should not have put it on Breslow, and you're right to point out that what really necessitated all of this was the injuries.
The only way I guess you could knock him was not moving on faster from some of these guys. Dalbec got enough rope to make a pretty noose, as did Valdez, but the alternatives were not great, and I can understand why, after Valdez's debut last year, Breslow might've thought he could give them a cromulent second base.
For the record, I agree totally with your point about the absolutely putrid performance of those players. Not that it necessarily "sunk" the season, but it's what kept them from playing meaningful baseball all the way up until lets say the last Saturday of the season as opposed to the last Tuesday (or however the days worked out, and I don't care to look at the day of the week they were eliminated). Breslow just isn't the one I blame for it.
I THINK what he probably did (or at least what I'd have done in his shoes) was outlined for Henry exactly where the major problems were in the organization and laid out the plan to fix it. But no rational person should expect that to be done in one fell swoop (and I bet it didn't hurt having Theo I'm sure outline the same problems). The big money contracts were all out there on players that cannot be depended upon (excepting Devers). Paying $30m for $27m in product doesn't screw a team; paying $18m for $6m and $26m for $5m does however really does. The only one that can "spend out of that problem" is Henry. I hope he will now that there is someone else advising him how to do it, but that of course remains to be seen. (To be clear, based on his handing out of deals, I would not have allowed Bloom to spend $100m of my money either, but conversely, I would allow Breslow to now, and hope Henry does, but I doubt it happens).
He also needed to fix the fact that pitching development and minor league acquisition was basically non-existent for the last half decade (which I think he did with Fitts, Priester, Sandlin and drafting Tolle). To be clear, do I think Fitts, Priester or Sandlin will be top of the rotation pitchers - no. But I think you're going to probably get a decent 4 starter (Crawford type), and a good relief pitcher out of those three, possible you get a 3, a 5 and a reliever also, but that is mostly because I really like Priester. Tolle we have literally no idea on.
Next thing he has to work on is the fact that you already need to use up a ton of bench spots with guys that need to be platooned (RF, DH, 2b) which doesn't seem that bad until one realizes that a bench spot has to go to a back up C (and to your point SHOULD have gone to a defense first SS with the assumption that Story misses ~ 100 games), thus your bench is already "full." Then when one player goes down (Casas) or two (O'Neill missing his customary 50 games, which was actually him "staying healthy" by about 3 to 4 extra weeks) you end up getting really thin really fast.
In my heart of hearts, I do not think the Sox are going to be willing to spend massive money (so forget Burnes, Fried, Bregman, Snell, Kim, Adames) and I don't think they're going to be able to find the kind of trade to get the pieces they need without giving up Anthony or Campbell (which I wouldn't do). But I DO think you'll see them go out and acquire a piece that provides some RH consistency (Hernandez, Santander, Gurriel types) and allows them to move something from that LH log jam for either simply the roster spot and a little cash saved to use elsewhere (Yoshida) or something that hurts more to give up, but you get something better like a really good 'pen arm or a projectable starter that we're not thinking of in return (lets say Abreu for Kyle Harrison type of move).
I said this last year, but I really don't think firing Bloom and hiring Breslow was the culmination of the rebuild. I think it was the realization that the rebuild didn't happen, and you needed someone else to come in. This will be more like year 2 of a rebuild (but one that should only take about 3 years) not year 5 or whatever. But with inheriting so many holes in the majors and upper minors, one can only fix so much in one off-season.