(1) I think Bulaga stays, but may start the season on PUP. Letting him go saves $5.15M against the cap, with a cost of $3.2M of dead money on the 2018 cap. Despite the $5.15M in savings, I'd still be willing to keep him, for now. Spriggs should be ok to go by TC, and Murphy was playing pretty well before he went down on IR. The injuries at OT this last season were just stupid. No team could have overcome that many injuries at one position. Packers were darn lucky that McCray turned out to be as versatile as he was.
(2) I think they keep Matthews, but only if he structures with an extension (2 yrs?) to get his annual cap cost in the $5M range. Then I suggest they move him back to ILB where he had his last pro-bowl worthy year (2014), in which he put up his 3rd best year in sacks (11), and 2nd best year in tackles (61), while he also chipped in 9 PDF, 1 INT, and 2 FF. He no longer can convert speed to power as an edge rusher, which means he's a one-trick-pony as only a speed rusher and can be easily neutralized.
(3) I would offer Jordy a restructure/extension as well (1 or 2 years) to cut his cap number in half. Then I'd move him to the slot where he played so effectively in his comeback year in 2016. He may not have long speed anymore but he's a big/strong/savy presence from the slot, and AR always looks for him. In 2017 he was on a personal best pace in nearly all categories until AR went down with injury. He can still play, IMO, and he wants to be in GB with his boy AR. He'd being more willing to make a restructure deal than would Cobb, also IMO.
(4) With Cobb I would try to trade first, and if not, then cut. Cutting him saves $9.5M on the 2018 cap, with a cost of $3.25M in dead money. I just don't see him with the same kind of explosiveness he had in his first few years, and he's mainy a slot receiver. With Jordy, and maybe Montgomery, taking more snaps from the slot, do they really need another (overpaid) slot receiver? He's not a #1 nor a #2, but he's being paid like one.