Lazar is already one of MacLean's favourites. The kid earned a spot on the team despite not producing a lick of offense throughout the pre-season. I have to imagine that was because of his tremendous work ethic and attention to the defensive side of things, but where I disagree with you, and perhaps the organization (we'll see after the 9 game mark what constitutes "playing himself off the team"), is in regards to how well he'll develop his offensive game playing primarily defensive minutes with an offensive-anchor of a linemate in Neil, and to a lesser extent Zack Smith as well.
He played a much more significant offensive role for the World Junior team than he has played for the Sens thus far. He was taking key offensive draws and playing a lot of minutes on the powerplay as one of the snipers the more skilled forwards were looking to dish the puck to. I wouldn't be that opposed to Lazar up with the big club if he were playing those important offensive minutes for the team, but up till this point, he has not played on the powerplay and at 5 on 5 he's played in a defensive role.
I think with his goal scoring instincts and great shot he'll have no problem scoring goals at the NHL level, but like I have said before, I'd prefer if this kid spent more time working on his offensive skills so he could become more than a gritty garbage guy. All that is separating him from becoming a Mike Richards-esque player is his hands and passing ability. I want Lazar to become a 60+ point two-way beast, not the Glencross/Fisher type player I know he can become even if he's rushed into the league.
Where we disagree is I think Lazar's offensive skills could improve greatly if he goes back to junior and plays 25 minutes a game as the primary offensive weapon for the Oil Kings, as opposed to playing 10-15 minutes on the 3rd/4th lines playing as a defensive specialist getting minimal powerplay time. That to me seems more like common sense than anything. If the kid gets more time to practice deking out defensemen, making passes off the rush, etc... he'll develop into a better offensive player. I don't think playing the same role that Erik Condra has been playing the past few seasons is particularly conductive for offensive development.
If you watch guys like Bergeron or O'Reilly (the latter I watched extensively in his rookie season) you could tell they had the talent to be top 6 point producers in the NHL. They both had the same attention to detail in the defensive end that Lazar currently possesses, but both Bergeron and O'Reilly have always had very slick hands and great vision/playmaking ability. Lazar is more in the Fisher/Glencross type mold in that he's a grinder with goal scoring ability, but lacks the offensive skills to become anything more than a 50ish point forward.
Again, I think he stands a better chance of becoming a Bergeron/O'Reilly if he develops those offensive skills significantly, and the best way for him to do that would be to play 25+ minutes a game against his peers, not 10+ minutes a game against men trying his best to stick with the team by imitating Erik Condra.