Ditto to what HH says. If it is on an LE area, maybe if time is running out or if I have fallen in love with him.
To me, it isn't about the size of the trophy but the quality of the trophy. Trophy is in the eye of the beholder. This is a truly unique bull and would be a great harvest in most areas. I do see where he can still do a little maturing but you are never guaranteed that. There are a lot of factors that go into antler growth from year to year.
If you are after pure score results then yes you wait. If you are after a bull with a lot of character and the situation is right and you like him, then go ahead and do it and don't regret it.
I have a Brother in law that drew a Panguitch Lake Archery Bull tag a few years back. He spent from April to August scouting and following one particular bull. He knew him inside and out. Two nights before the season started he called him in to within 100 yards and then backed off some to not make him wary. Opening morning he was set up perfectly, he bugled and bull came on the run. He was 40 yards, perfect shooting lane, he drew, but he couldn't release. He couldn't bring himself to do it as he felt he was too close to the bull. So he passed. Another hunter killed the bull a few days later and it measured somewhere around 370. My brother in law never regretted one bit of it, to him it was his most successful hunt. He didn't need to kill the bull to enjoy the hunt. Granted he has no trophy, but he has the memory.
UTROY
Proverbs 21:19 (why I hunt!)