Lebron has been a candidate for the greatest NBA player of all-time, for quite some time now. It has been controversial but legitimate arguments can be made for both sides.
The NBA's lockdown has potentially taken a ring away from Lebron as the Lakers were very much in the title hunt. Lebron has to feel like this is the worst timing ever for a lockdown. Lebron's age makes every season a must especially after he already had to sit out most of last season.
Some people may feel as though the Lakers will come back next season and pick up where they left off but nothing is guaranteed. They may not be as healthy are they now, other teams maybe just a little bit better next season. This was definitely more of a blow to Lebron more than any other player in the league.