As do I and I think it's hard to believe HuGo would pay Dubois any more than him on this team. Should we sign him it would be because he fits the model Hughes is trying to build. We have 8 million dollar players at best and to contend we'll need more than adding PLD at that level.
The contract can be easily structured to be worth more than Suzuki money at a 7.5M AAV for Dubois, keeping the Cap hit in reign and establishing, along with Caufield, an internal cap range between 7 and 7.875M for key core pieces. I could see Caufield signing for 7.25M, maybe less at 7M, but not as much as Suzuki, for sure.
The advantage of establishing an internal Cap ceiling in that range will be the pressure on limiting 2nd NHL contracts for other prospects with high ceilings, enabling Hughes to keep a roster together for longer periods of time.
Again, I return to the Malkin example who matched Crosby money in his second NHL contract, but for only 5 years. Then, he got more than 8.7M long term (9.5M, 8 years).
So, for example:
Dubois is acquired via trade for 8 years. Caufield signs for 8 years and Suzuki has 7 years left on his contract, all between 7M and 7.875M.
Montreal wins the 2nd lottery and nabs Fantilli who has three good NHL seasons starting in his D+1 season.
If he signs for 5 years at 7.875M (the internal Cap ceiling figure), he will be eligible to signe an 8 year contract at higher money than Suzuki in his prime. Suzuki won't be worth as much in his next contract because he won't have as many prime years remaining (and that will help to balance out the new total cap because of the new internal Cap ceiling).
Plus, at 33 now, Montreal can either move on from Dubois (replaced by Fantilli, anyhow), or extend him for a short term value contract to keep vying for a cup.
I see no problem with the Habs' Cap if they acquire Dubois. It extends to other players, with Forwards and Ds and the overlapping of ELCs, 2nd NHL contracts, etc.
It's entirely manageable and an ex agent as GM should be all over that reality no problem.