Hard to judge Alexander this early.
Rose is mostly playing the field, some variation brings him inside because Hamilton runs funky run-and-shoot stuff, but still got burned deep. That was inexcusable, and on a play when the rush was in Evans face. Rose was getting ready to run up there and celebrate a sack, his feet stopped and he was watching the backfield. Not many positive plays for him in this game.
I expect the trouble with the medium-underneath stuff vs a scheme like Hamilton's if the QB is accurate, you can't really cover their 3 man (4 man with the fullback and put that doubt in the Bombers D early) route combinations you have to guess so there's often going to be a guy who is "wide-open" but it's on the QB to read that half of the field post snap. Or you run more zone stuff to challenge the QB and risk getting beat deep (ultimately what I would prefer to do vs run-and-shoot in a vacuum). Theoretically if you have any pass rush that's how you defend that offensive scheme. We didn't have that.
Parker is playing the boundary which is quite often the hot seat where Dunbar is. He didn't get beat deep which is his job. If there wasn't a total defensive collapse his day would be fine. Going to give up some first downs.
Holm was the only DB who came up and made plays on the ball. I feel like Nichols will be playing a lot more of a deep half that Taylor played with the safety with Taylor out, looked that way today.
The big plays to the tight end we'll never know who's fault that is without knowing the scheme/call exactly on each play. The backers key looked to be run and then drop to crossers. Both those big plays were wheel routes behind a trips formation, one was backside crosser to seam. Some teams would cross their halfback with a SAM if they like the matchup better on a certain slot, some teams would prefer the halfback stay on the receiver and the SAM take the guy who is usually a blocker with a run key too. None of the 4 DB's (including SAM) on the side of the field where that route ended up took the deep routes by 38 for Hamilton.
A big thing is that it's not really going to help to keep moving guys in and out, around the field. 4 games left, maybe try someone new next game but would be nice to let a group in the secondary play out the season to develop some familiarity and chemistry for playoffs.
He's had fumbles like that almost weekly unfortunately.