I think Chara’s plans come into play here heavily. I think Chara will be back for one more season (unless they win the Cup). If he isn’t back, losing Chara and Krug in one season would significantly change the look of the teams blue line.
I’m not even sure how you make that top 4 work. We talk about Vaak as a future top 3 D, and that might be true...but those that watch Providence all the time like BruinsNetwork have put both Lauzon and Zboril in front of Vaak at this moment in time.
In the long run, I think you would want
Gryz McAvoy
Vaak Carlo
Zboril/Lauzon/Clifton
You want to put Gryz and McAvoy together, but Carlo needs to be paired with someone with puck skills. Vaakaneinen fits the description, but is he ready to be a plug and play top 4 D in the shutdown pairing? Seems like a lot to ask given his season.
So basically, if you let Krug go, you need Chara to hang on one more year to break Zboril, Lauzon and Vaak into the lineup and see who is ready for top 4 duty.