Well apart from the fact that he's absolutely the antithesis of "Bruin Strong", he also hasn't scored a goal since 2012. He only had 12 assists and zero goals in 58 games last year. So yes, I'd say he's a worse option than Cleary if you want goals to be scored. A year ago Cleary had more goals than good knees. What's Leino's excuse?
Probably that he was a 3rd liner at best getting paid 5M dollars a season for 7 years. Hockey is a game of confidence, as soon as you start failing expectations, the game becomes harder and harder. Imagine if Cleary was expected to be the second best scorer on our team. Both players play a different style, but Ville has a chance of being able to put up some more points with a good supporting cast.
Take a look at BUF's roster last year:
That team has literally NO supporting cast and all his linemates are small. He clearly needs someone on his line to give him space to work.
Regarding your point about his playing style in Boston, I agree 100% that hes soft as butter.