Brajan Gruda is a great talent and would be my dream signing for this summer window. Then there is also Pavlovic who had a break through season for Bayern and only missed out on the EC because of an injury. Thiaw is a big CB talent who recently lost his starting spot for Milan. Maxi Beier who didn't really play this EC could become an option as a striker but he's not really a target man either. Ouedrago was just signed by Bayern before the tournament and could be a future CM prospect. Can Uzun unfortunately chose Turkey but he could be the next big Bundesliga product coming through besides Gruda. Those aside, I don't really see anyone with the potential to be a starter for Germany. Adeyemi at Dortmund maybe as well but he'll have it difficult and has many injury problems. Jury's still out on Moukoko as well who is clearly very talented but waiting for his break through season.
Gruda does look a great, albeit still raw, talent. For Pavlovic, I understand people are clinging onto hope for a new Kroos but I honestly don't see the potential right now. People are quoting his pass completion rates but that removes the context that a lot of them are safer passes that don't necessarily create chances. He doesn't have the creativity in his passing that I would want from a number 8, while he will retain possession well you'd be very dependent on others to create chances and play incisive passes.
Thiaw and Beier seem like decent talents, I honestly haven't seen a lot of Thiaw but have tried to follow him at Milan where, as you mentioned, he's lost is starting spot. There's also Bisseck at Inter and Bella-Kotchup who barely played at PSV due to injuries. Beier, I don't have high hopes for, he seems very clumsy in possession and is a worse version of Schurrle at Mainz. Don't get me started on Adeyemi and Moukoko, I've never seen the talent they've been hyped up about and don't think they'll amount to anything more than midtable BL starters. I have a bit more hope for Moukoko than Adeyemi but neither I would say are going to be saviours for our team.
Ouedrago I think went to Leipzig in the end, might actually be better since he'll get more playing time.
In the end, I don't have much hopes going forward in terms of talent. The 2009 generation (Neuer, Howedes, Hummels, Boateng, Kroos, Khedira, Muller, Ozil) was truly a golden generation but the big miss was the next generation. A huge group of talented players who, for some, either lacked the work ethic to fulfill their potential (Draxler, Brandt, Sane), made bad decisions by sticking around middling clubs rather than taking the jump to a bigger club (Tah), had their development stunted by injuries (Goretzka, Gotze, Sule) or just didn't turn out to be as good as initially thought (Henrichs, Leno, Werner, Ginter, Meyer). I still look back at the summer of 2017 when we won the Confed cup, beating full strength teams like Chile, Cameroon and Mexico, with our U-21 team and our second string U-21 team won the Euro championships (beating a very strong Spain team with Saul, Kepa, Ceballos, Ascensio, Rodri etc). Some ofcourse did either fulfill their potential or become better players, like Gnabry, Kimmich, Ter Stegen and Rudiger but those alone could not carry the team and we had to continue to rely on the older players.
That group was supposed to take over from the previous generation that won us the World Cup but none of those players fulfilled their talent. Just going through the names makes me annoyed to think how talented they were when they broke through to how they are now. I don't really see the same talent in this next group but you can hope they have more mental strength to become better players.