Suter never won a Cup or Norris...
Anyways, I took a look at the five players' last six years production. Salary numbers are for the next four seasons, so 2015-16, 2016-17, 2017-18- and 2018-19 and in Chara's case he expires in 2018.
Code:
Player GP Points PPG +/- Salary Average Post-CBA?
Gio 397 210 0.53 27 ? ? Yes
Keith 444 287 0.65 85 23 5.75 No
Doughty 443 240 0.54 55 29.8 7.45 No
Chara 428 219 0.51 124 16 5.33 No
Suter 438 235 0.54 63 36 9.00 No
I think you can argue that Gio's production was very similar, the "pedigree" or "durability" not so much.
On average, the salary of those four players comes down to 6.9 Million.
I think that's exactly what Gio is worth for the next four years.
He makes 4M next year, so to get him in line with that value you'd have to eat an average value of 7.9M for the three years after.
Adding a two more years of term @ 6M to drop the cap hit and you're right back down to around 35M / 5 years.
I think that's the contract we need to sign Gio to. AAV of 7M