He has really struggled these last two games. One thing that really stands out to me is that I don't notice his "supposed" strengths. I rarely notice any big hits from him, I can't recall him bullying players in front of the net and in the corners, he rarely fights, he rarely gets in other players faces or tries to stir things up to spark the team. I get that he has a lot of other flaws but when he doesn't even stound out at the role he is supposed to be taking on that is a problem.
Gudbranson, for all his faults, still threw massive hits, bullied opponents around the net, jumped into every scrum and threw bombs when he fought. The past players from the Sens who took on this D enforcer role were Mark Borowiecki and Matt Carkner and both of them stood out more than Josh Brown. Their faults and flaws are much easier to live with when they are at least bringing something of significance to the table.
Brown has been given quite a bit of time to embrace his role and the Sens even parted ways with Gudbranson, giving Brown the sole responsibility to take on this role on the back end. Brown has not embraced this role and there is little indication that he will embrace it more in the future.. Given that he is a UFA at the end of the season it looks like it will be time to move on from him.