They also cut two other 2021 3rd rounders G Wyatt Davis and LB Chazz Surratt. Rick Spielman made 7 picks in the 3rd and 4th rounds last year and 4 are already gone after one season. (5th rd TE Zack Davidson and 6th rd DT Jalen Twyman were also waived today). Now some or all may be be back on the Practice Squad, but still. But the new regime didn't pick these guys so they have no ties.
Now I know you can't hit on every draft pick but 3rds and 4ths aren't just throw aways like 6ths and 7ths. And for 4 of 7 to bust that fast is atrocious. (Mond was always a project and Surratt was seen as a reach at the time to begin with.)
Just to be fair and not pile on, the picks that remain from last year do seem to be on the right trajectory:
LT Christian Darrisaw (1st) looks to be an above average LT after 1 year,
DE Patrick Jones (the last of the four 3rds) has flashed at times and had a great camp.
S Cam Bynum (4th) is a starter,
RB Kene Nwangwu (4th) ran 2 kicks back last year, and has talent to be a gadget guy
WR Ihmir Smith-Marsette (5th) also had a good camp and seems to be a depth WR/PR at the worst.
So you're batting almost .500 but to miss that badly on three 3rds and a 4th still isn't good.