Do you understand the difference between theory and practice? Of course they have Richards, I said it was likely, it is also theoretically possible to do it without winning any.
You do realize that there is also the idea of "practically impossible". While it is theoretically possible that a future greatest goal scorer of all time never wins a season goal scoring title, it would also be highly, highly, highly unlikely to happen - as in practically impossible.
Just think of the theoretical things that would have to happen.
1. This player automatically loses an all-time peak comparison, because he can't even claim one Richard trophy, whereas other greats have several. It implies that he does not have the single best goal scoring season.
2. This player would have to be beaten by different players every season of his career, because if one player played in the same era and won multiple Rockets, then he would be considered better at goal scoring.
3. In order to make a valid excuse for not winning a Rocket, this player would have to suffer a minor injury every season (say missing around 5-10 games at most), and then lose the goal title every time by just one or two goals.
4. This player would then have to have the unquestionably greatest playoff goal scoring resume of all time; easily exceeding those of players like Rocket Richard, Jari Kurri, Mike Bossy, and Wayne Gretzky. This is needed to make up for the weak regular season resume.
5. Longevity would be a must for this player, since his peak is so weak. So what are we talking here? 20 seasons of averaging almost 50 goals per season? Again, with different players somehow beating him every season.
6. This goes with point number 5. And how likely is a guy that gets injured every season to play 20 seasons of out-of-this-world goal scoring hockey? Would he not likely slow down from all those injuries?