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No one said Chelsea is a weak team, Chelsea is a big team but can't play as a solid team now.
However, if we compare Chelsea and Real Madrid, Real Madrid surely plays more solidly and has a better experience in UCL competition.
You can't expect Aubameyang to give a big contribution if he only sits on the bench. Lately, I rarely see Aubameyang played as the starter. Chelsea coach prefers to choose Felix, Sterling, or Haverts as the striker. Moreover, Aubameyang is no eligibility until June 29 in UCL. So, it is clear that he can't play in UCL against Real Madrid.
Chelsea's squad is certainly not weak. At least they are a lot more stronger to finish in the top six. Chelsea is just not being able to perform well because of bad authority. Any good coach could have done a lot better with the same squad that Chelsea has right now. Just imagine the same squad with Zidane being the coach. The outcome would have been absolutely different.
Chelsea was already in a big crisis this season in the Champions League, because after losing to Dinamo in the group stage, they were last in the group after the first 2 rounds. After that, the former coach Tuchel was fired, and the new coach Potter significantly improved Chelsea's game. Chelsea won all of their remaining group games and eventually finished first in the group. Therefore, the change of coach helped the club and saved the season in the Champions League.
Can history repeat itself with a new coach?
It is very difficult to predict how Chelsea will play against Real with a new coach, but Chelsea should not be underestimated. It is enough to remember the 2 meetings between Real and Chelsea last season in the Champions League.
It will be hard for Chelsea to find motivation at this moment. But Chelsea should also realize that the only chance they have of salvaging something this season is probably the champions League. But I believe Chelsea would have had a better chance if it was anyone else other than Real Madrid.