The GM said that is not Lou but more likely the quote came from Burke who did offer sheet Penner long time ago and got him. I just do not see Lou would do this as the success rate is low and very unlikely that any of the Toronto young guns will go for it. However other teams in the Atlantic division (like Sabres) may do it if they play well next year, or even Bruins if they get rid of some bad contracts and free up more cap space. The Atlantic teams will have to the most to gain to force TML to pay more for their top guns and they have at least 3 other contending teams in that division, if Pathers rebound. Also divisional teams normally do not trade with each other so the negative fallout from it will likely affect them less, not like the Isles who may still deal with Toronto in the future if the deal works out for both team. Actually the team TML need to worry the most is Sabres as AM and JE are friends and with JE/Dahlin combo it may really interest him to sign there especially if there is more misunderstanding between him and the coach. Rags may be another team with all the cap space they have and piles of draft picks they have compiled now. The big apple is the centre of USA and Matthews is an American born player so he may be very tempted to move back to his country. Also watched for Vegas, another team with money/cap space/draft picks and very closely located to his home state Arizona.
Isles is going to rebuild/retool and need all their future picks so make no sense for them to do this, especially when their most talented players (except for Lee and Ebs who both are UFA next summer) are real young and with the expansion drafts coming in 3 years. 2019 and 2020 draft picks are the best way to protect your assets as they will be waiver exempt. If the expansion draft is not there, it would be a complete different story. Without a good rink soon, I do not see Matthews will want to go there. If Isles submit an offer sheet, Rags would mostly likely also do one and they likely will have the better chance to sign him with an American college coach.
Think they just really need to focus on two items - get a decent 2nd/3rd line center on a short contract (2 to 3 years max) as a stop gap until they move into a decent arena that will attract UFA and do everything they can to entice Sorokin to come over in 2 years after his KHL contract expires, develop Soderstrom as plan B and draft the best available 2 way center with the 2019 pick as I know there a lot of blue chip centres in this draft, even if you do not get Jack Hughes, you can end up with a very good one. Preferably they will finish in bottom 5 this year and I think they do not even have to tank intentionally because the line-up they have today will be hard to compete with most of their divisional rivals even with the rebuilding Rags as they still have King Henrik and some pretty good forwards.