I'd say LeBron coming back from 3-1 against the Warriors last year is comparable to what Brady did in the Super Bowl, considering with both they will be their absolute pinnacle moments (LeBron winning for Cleveland and Brady winning his fifth). That was a 73 win team, hobbled or not. Without LeBron, the Cavs are maybe a .500 team if even that.
I think Jordan is the GOAT, but have we ever considered he won all six rings with Scottie Pippen, a really good supporting cast, and a coach that went on to win 5 more championships with a different team? I sure have heard a lot of Brady deniers speak similar sentiments. LeBron was/is coached by Erik Spoelstra, Tyronn Lue, and some other scrubs who aren't even in the league right now. Is he the Peyton Manning of basketball? I don't think so...LeBron has shown up many times and proven to be at his best in the highest pressure situations, maybe not like Jordan, but who knows? His margin of error is zero with some of those teams he carried. Manning...completely lacks those moments tha make legends and turtle shelled like no other in the biggest games.
It's similar to the Brady argument where parity makes it harder to dominate and win every final, now matter how good one player is. Only difference is that Jordan is about as a high a bar as it gets, whereas Montana's accomplishments and place in history was not so insurmountable.