They did as much as they could without giving up their 1st and top prospects
They gave Pittsburgh three very solid prospects, a 2nd that could have turned into a 1st if they'd made the final, a 5th, and a serviceable scoring forward in Bunting
Carolina is very well run, they draft well, they don't flippantly move out picks and prospects, they don't overpay, and they generally don't give term to older players
I've criticized them in the past for not stepping off the fence, they did that this season, but even when they didn't they were still viewed as a contender