Overall it seems that in all races AMLO vote share > Congressional (MORENA-PES-PT) vote share > MORENA-PES-PT Governor race vote share (where relevant).
This seems to indicate that even if AMLO does not mess up MORENA will not be the electoral powerhouse it is this election cycle without AMLO.
It depends. This is because right now AMLO is the only significant, well liked figure in MORENA. No one else from MORENA could win the Presidency today.
However, now MORENA has Governors. AMLO also became a national figure through his time as a Governor. If even just one of these Governors is popular and achieves substantial reforms then MORENA could very easily continue without AMLO.
I agree with this. Right now, MORENA is “AMLO’s party.” As of now, there’s a chance it could fall apart without him, but as you said, the more high-profile the party’s elected officials are, there greater the chances of the party not only surviving but remaining competitive.