There's a lot that's not quite true here. 1) I don't think McDavid was playing injured, he just had a slow start. He definitely didn't look like garbage at any point, let alone the first 3rd of the season....he had 40pts after 25 games.
For the people who are also forgetting what actually happened during a season that is still in progress and to any people from the future looking back to see how things actually unfolded as it happened, I'm going to break it down into progression bullet points for clarity.
1. McDavid and the Oilers started slow and looked bad doing so right off the bat this season. Being the elite talent that he is, McDavid can still put up points while starting slow, as evidenced by the 8 he had through his first 5 games, which just about lines up with his PPG for his past 400 games entering this season. I do not believe he was injured. It was simply a bad start by the Oilers from top to bottom.
2. McDavid sustained an upper body injury in that fifth game. He didn't play the final four minutes of regulation or overtime.
3. He was expected to miss up to 2 weeks which was 5-6 games on the Oilers schedule.
4. After losing in overtime during the game he exited, the Oilers lost their next two games badly, pushing their record down to 1-5-1. Panic mode began to set in. The Heritage Classic against the Flames was the next game and with the Oilers threatening to free fall, McDavid was brought back early after just two missed games.
5. McDavid had an assist in his return game win. Again, the guy can put up points even when not looking right.
6. The free fall continued with 4 straight losses and a fired coach by the end of it. McDavid went pointless in 4 of his next 5 games. For reference, he had notched at least a point in 65 of his previous 68 regular season games. He then had 3 points in his next 3 and 6 in 5.
7. I watched most of these games, as did others who watched them all. It's not necessarily just about what he was or wasn't doing in regards to putting up points. McDavid did not look remotely like himself. He didn't have his speed and for a player who easily draws your eyes immediately to him any moment he's on the ice, he was as close to invisible as one could be. He very clearly looked like a guy who got injured, felt an obligation to come back early because the team is directionless without him, and then played through said injury when he would have been better served sitting out a few more games and another week to properly heal.
8. I've used Jack Hughes as an example before. He suffered an upper body injury early on as well (shoulder I believe). He was able to rest the prescribed two weeks because a.) The Devils were 6-4 and b.) They were believed to be a better team than they are and were still hopeful early on. There was no mad rush to get him back, nor was there with his second injury in early January that kept him out a month (The Devils were 21-14-2 when he left, still in decent shape).
9. The turnaround for both the Oilers and McDavid began the day this thread was started. There's still been stretches of time where even though McDavid has 83 points in his last 42 games, I've wondered if something is still ailing him because of his extreme aversion to shooting at times, but I'm not willing to dig down in that speculation.
In conclusion, McDavid looked absolutely terrible and not himself for a few weeks after his early return from injury. He looked like exactly what he was: a player "forced" to come back earlier than expected because his team was in dire straights so quickly into the season and thus playing through an injury not allowed to properly heal.
The great thing about McDavid is that he has usually proven that by the end, we don't need to rely on the crutches of excuses and what ifs. He went through all that and I trust that he'll still win the Art Ross, and depending on how voters feel about the narrative, could very well win another Hart.