I am not sure "dismantle" would be the case. I mean Bayern is a bit more physically gifted team and they play like a machine, whereas Barcelona is a team of mind and they play with a good tactic and technique at the same time. So, it is going to be battle of two different mindsets and I am not sure if any team will dismantle the other.
So all in all, we should be focusing a bit towards how we could end up with a situation where it is close to a tied game, maybe one will win but the difference will not be big neither in score nor while watching the game neither.
But for now Nagelsmann is also busy with the condition of their players who seem to be losing productivity, especially when they see their draw for 3 weeks in a row.
It becomes a bit difficult if Barcelona play like they always show in La Liga this season. Apart from H2H which put Bayern ahead, it will still be a little difficult to predict who will win now.
In a few days Bayern will face Barcelona, it's a game that attracts a lot of attention. Because both are strong teams in Europe,
Bayern and Barcelona actually have almost the same strength, both teams have quality squads. The problem is that Bayern's performance
in the Bundesliga is not so good, they have drawn 3 times in a row. As you said Nagelsmann is now definitely busy thinking about the strategy
he will play against Barcelona. Although Bayern's performance in the Champions League was quite good, in the first match Bayern managed
to beat Inter even though they were playing away. But Nagelsmann realized Barcelona had a better performance, because Barcelona played
very consistently.
After all, Barcelona have Lewandowski who might be the decisive player in the Bayern vs Barcelona match, This of course will make it difficult
for Bayern. But I'm sure Bayern will give their best against Barcelona. I chose not to bet on the Bayern vs Barcelona match, because I think
the same as you, the outcome of the match is difficult to predict. But my prediction is that the match will probably end in a draw, because
I think it's the best result for both teams.