You don't remember "what's wrong with D-Wade?" becoming an annual thing those last couple years? There was nothing wrong with his regular season, it was the playoffs where he faded big time in '13 and '14. '13 playoffs he averaged 16, 5, and 5 on 46% shooting and 3.6 FTA per game. '14 playoffs he was slightly better but awful in the finals.
I just went back and watched highlights from game 6 of the '13 finals and the crew that was on the floor for the Heat when they made their run in the fourth boggled my mind. It was LeBron, 37-year-old Ray Allen, 33-year-old Mike Miller, 34-year-old Shane Battier, and Mario Chalmers. Two of those guys would retire a year later, one of them went on to become a career backup point guard, and the other could barely walk. Somehow LeBron overcame a double digit point deficit with those guys sharing the floor with him in crunch time during the highest leverage situation imaginable (and he made plenty of mistakes down the stretch, don't get me wrong).
I wasn't trying to put words in your mouth regarding those previous finals, but I don't think it's pumping his tires to describe that as an all-time great performance. (It's worth mentioning, even as somebody who thinks D-Wade is the second best two guard of all-time, that he was never an ideal fit with LeBron). Ultimately, I'd rank LeBron's playoff moments something like this:
1. Games 5-7 against Golden State '16
2. 29 straight against Detroit '07
3. Games 6-7 against San Antonio '13
4. Game 6 in Boston '12
5. Game 7 in Boston '08
6. '09 conference finals vs. Orlando
7. '15 finals against Golden State
You could re-arrange the order some and I wouldn't argue, but to me #1 and #3 are the first mentioned on his tombstone. That - along with possibly this year - will be where the argument starts if he ever passes Jordan.
The narrative wasn't "What's wrong with D-Wade", it was "The Heat are managing his minutes to save him for the playoffs". He also didn't "fade in the playoffs" given that the 46% he shot in the postseason that year is only 1 less than his 47% career mark, and the lower FTAs were due to generally having the ball in his hand less, as evidenced by the 5% drop in usage and 5 less FGA that season. He really only had a poor final 2 games against the Spurs, but both games were nearly 20-point blowouts anyways so can't really pin that solely on Wade.
I can't really take your talking about a specific portion of a game where the Heat had 2 of their big 3 resting on the bench against a Spurs team that basically played 7 guys in games 6-7 of the 13 finals, 2 of those were a 36 year old Duncan and a 35 year old Manu, 2 more being Gary Neal and Boris Diaw's fat tits. You also didn't mention Parker going 6-23 in game 6 or Parker & Danny Green combining for 4-24 in game 7. Stop selectively picking your anecdotal Lebron memories to build your case on, you sound so very much like Brian Windhorst when you do that.
Thing with listing Lebron's great achievements is that you can list nearly as many black marks that hurt his case:
1. Getting completely destroyed in the 07 finals even though the games themselves were much closer than anyone remembers
2. Giving up against the Celts in 2010
3. Relocating to build his original super team (I actually blame him more for going back to Cleveland when this super team started to age but this is still a point of contention for many people)
4. His complete meltdown in the 2011 finals
5. Leaving his partially aging super team to go back to Cleveland under the condition that they restack the deck in his favor
6. Being 3-4 in his 7 NBA finals series. Even forgiving the 07 finals he'd still be at .500, name me another top 3, 5, or 10 player (who didn't come from the Bill Russell era) with such a mediocre finals record.
Adding everything up, It's hard to make any serious argument for LeBron over MJ unless James leads his teams to another couple titles.