...Is Michael's attitude towards Connie influenced by the fact of what happened with Carlo and Michael knows that Connie knows who ordered it.
No.
... Michael cannot risk offending Connie as much as vice versa and that is why she got away with so much.
Michael had already 'offended' Connie by having her husband murdered. It was Connie who came crawling back to Michael after their mother's death.
Connie got away with 'so much' because unlike other siblings, she remained loyal to the Family and never betrayed her brother.
Good discussion.
