It might be illness, honestly, but simultaneously, I dispute the extent to which both Burns and Orlov have been liabilities. Yes, they make a crap-load of mistakes, and yes, neither are exactly the fastest guys, especially Burns (of course). But both still move the puck way better than most defensemen even now. We now know from analytics that the biggest liabilities in the league are guys who either have no ability or have lost their ability to play the puck. Typically guys who move the puck a ton will also turnover the puck a bunch.
Also worth noting: outside of a few bad games, our team defense, when all put together, still has been one of the best shot-suppressing units in all of hockey even with all of our alleged liabilities. Maybe we need to be a bit more confident that our whole is greater than the sum of the parts.