It shouldn't have to be one or the other, and to be honest, I'm not sure if, for this year only, Broberg is the better option than Kulak.
I wonder if Kulak could be okay on the right side. We know Ekholm and Nurse are our top two LD, the only question mark is the 2nd pair RD, and it comes down to whether Broberg or Kulak is a better option than Emberson in that spot. I don't recall seeing Emberson play at all, so that might be way too much to expect from him, so if we want Broberg in the position with the best chance to succeed, 3rd pair LD is the best bet, but we need to figure out which guy is playing the off side with Nurse.