What does Richard/Belzile bring to the group that Ylonen doesn't? They're also 3/8 years older respectively, so there's a lot less room for improvement.
Not sure what you mean by Pezzetta being past his expiration date. Could we upgrade on him? Sure. Are Belzile/Richard the right type of players to do so? No. Even in Laval, we don't really have anyone that could fill his role. Simoneau would be the best fit, but I don't see him being ready for a tryout yet (if ever). Even in the unsigned prospects, you pretty much only have Tuch, F. Xhekaj and S. Harris that would fit.
As for Richard, by 1 time you mean 13 games? Before that, he had 2 games in 6 years. Even in Boston, he got passed by Boqvist, Merkulov and Brown for a chance to play in the NHL.
Belzile was a dime a dozen player. I'd be more inclined to think that you have selective memory. This year, Belzile has been passed by Blidh, Othmann, Edstrom and Brodzinski for a chance to play in the NHL. He's a great story, I remember arguing for him to be kkept back in 2013 when he played for Hamilton, but ultimately he's unlikely to have a permanent spot on an NHL roster.