Two comments: one I consider significant; one just a low-data-point opinion.
1. If you are concerned about Coach Hiestand's ultimate relationships with his players, dig out the clip of the post-season team meeting being run by Coach Kelly when he surprised HH (who was almost hiding away in the back row in isolation) by saying "Come on down, Coach Harry Hiestand!" Hiestand was confused but wandered down the steps. Out came Aaron Taylor with a very large object covered with a cloth. Hiestand began to make a small grin. Then Aaron threw the cloth off as McGlinchey, Nelson, Bars, Mustipher, Kraemer et al ROARED and rushed him. {note by the way that all five of those guys are in the league.} This is not the behavior of players who dislike a coach.
In my opinion, Eichenberg didn't like Hiestand because Hiestand thought that Tommy Kraemer was better at that stage of their careers (an opinion in which I concur --- Kraemer was a much faster learner than Eichenberg even if Big Tommy was a true guard rather than a tackle.) Hoge? He was apparently a press-clippings-reading self fantasizer. We need none of those. He had chances to play, and mainly didn't have the necessary straight-on power not to get buckled.
2. This second remark is a mere intuition based upon not enough game reps: Alt looked to me as potentially a really great space-covering tackle and possibly ultimately a left side eraser. I'm not talking about non-football athleticism here (I know nothing about that), but rather on-field-doing-the-left-tackle-job athleticism. To me Alt looked astonishlngly good for his experience. Fisher MUST be essentially equally good or the very smart staff wouldn't have put him out there. But I've not seen quite enough reps yet. (especially in the heat of a season.) This last ranks as BS by me at this point, but I still am not surprised at projections of Alt at LT.
BTW, if Coach Harry can consistently get his NFLers to meet with recruits, any "Old Man Oldschoolism" will be zero issue to any kid who wants the best and an NFL shot. ZMart, Nelson, Stanley, McGlinchey, Mustipher, Bars, NMart, Kraemer, and if he's finally grown up Liam too. Watt helps.