Perhaps the titles are just to lock him out of transforming into certain annoying forms but doesnt actually help to win the fight.
It'd give people a reason to collect the various titles and another reason to actually defeat the 3 beastmen leaders/do the candy BCNMs/Odin/Salvage etc?
Galadar is the only wrench in this theory so far.
Wonder if he can mimic Odin... if thats the case, the title theory would look plausible again..
The only reason that im even leaning in the direction of titles affecting this guy is because the entire last update could be summarized as "Touring Aht Urhgan" so perhaps the titles just limit his forms.