I think it's quite logical that Guybrush has become more than his old self in previous games.
There's obviously a time difference of a decade - in the "What's Guybrush's age?" threads they estimate he's maybe as young as 16-18 when he's a pirate wannabe in Secret of Monkey Island and now in Tales of Monkey Island he's around 30, which fits in with Morgan following the adventures of Guybrush "since her childhood" and the decade's worth of booty in Guybrush's ship hold including a crate of fine leather jackets which he apparently does try to sell.
He's not a pirate wannabe any more. He's a Mighty Pirate™ with a T M these days. But he's still got that Guybrush charm, can get insulted a couple of times, makes a few blunders from time to time, but now has a razor sharp wit and even heroism (which the Voodoo Lady points out).
Incidentally, if Stan calls Guybrush "kid" how old does that make Stan?