But it doesn’t mean he doesn’t know and doesn’t want.
But he had lesson from Sabo, so now Luffy more careful with Ace’s secrets.

Luffy is a really one.
Just if Ace is rll active and loud in his parental brotherly way for successfully raising such person as Luffy to his 17 and gave him enough training so he won’t die alone.
Luffy’s a tricky one.
He would say no word if there’s no reason for Ace be mentioned

Ace ril gonna give Sabo to much himalike kids and Sabo so excited and happy bc more lit ace he could cherish and he can't love his hisband/brother more but there it is
Sabo adore Ace how Gomez adore Mortish
And they fuck rll a lot.

Also That’s why Ace in first place rll didn’t like Luffy(bc of jealousy)

Garp’s favorite, as the first grandchild, and little scary genius in battle brat.
There’s a possibility that’s Ace’s for some time keep his thoughts of being pirate in private bc doesn’t want to upset gramps.

Knew of Portgas’ wings.
And knew the real reason of his back’s scares.

That’s also the reason why he has only one nest in his life.
At their treehouse small and comfy place whit his brothers where Ace could without fear cuddle and rest.
After setting sail he was only in others’ nest, but not his own.

That’s why he think for real many times when take decisions. That’s why he never choose to be under else Jolly Roger.
That’s why he work harder and harder, never stop training, and always has suppressants, that’s the reason that’s in his crew more betas, than alphas.

Ace’s already crazy and creative enough, he’s just not put all his effort in training and improving his techniques on that aspect while he’s also have to still keep in secret his ability of logia.

The main point,Ace didn’t so dependable on his DF and world somehow still doesn’t know identity of Fire logia. (deuce and whole brain team rll dong the best they can do)
Ace’s tendency in battle is alike Garp’s and he uses weapons in unique, artful,tricky way.
Pipe, gun, dagger and etc

There is none Fire fist Ace. I still didn’t come up with new title. Though information of mera mera no mi user is one of Spades unfortunately still spread around, but nobody can still figure it out.
As a result, Spades as crew a bit slow down and has more time for level up