Bayern Munich has proven once more how bad they need a complete forward like Lewandowski. They still continue to lose points in the Bundesliga because of not being productive. Being unable to score against even a team like Augsburg is indicating a huge problem for them. Mane is a great transfer but he shouldn't be their striker choice. Mane should play on the wing just as it was at Liverpool. Maybe it is difficult but they had better do their best to sign Kane. He is the most logical player to be brought to the team now to solve the scoring issues.
Nagelsmann strategy was wrong when he thought Bayern can be more better without Lewandowski because he has left big hole to forward line Bayern and this also became an Bayern weakness this season because there is no player who can replaced him and when people expects Mane will be successfull to played as centre striker but in fact he failed to adapt even Mane already through 5 matches without scoring goals and so far this is his bad records compared to when he was a Liverpool player and Nagelsmann position also will not comfortable because some rumours mentioned he will be replaced by Tuchel
I feel like it wasn't his decision to send Lewandowski, from last year until his transfer was done, it was talked about how Lewandowski wanted to leave for Barcelona, not because of any financial troubles, probably not even regarding success because Barcelona was a worse team than Bayern, so it was probably regarding his love for the club or something, he just wanted out.
So, it forced Nagelsmann to find way to work the team without him, and maybe it may not be great now but it will get better. This is Bayern we are talking about, they always find a way to make it work and I feel like it is going to work out in the end for them once again.