Yeah, that just feels.... anticlimactic. Oh well, since he was removed from MC status, yeah¯\_(ツ)_/¯
He is still the main character's father, the idol of both the love interest as well as the rival, and his death is suppose to eventually led to the conflict between the two boys (as well as being the original main character of the franchise). It is completely natural to expect it to be more than...this.