https://www.youtube.com/watch?v=m21tvASKKHw
He's a high ability player from a major school (UCLA). At 6'1", 190, he probably needs to add a few more pounds and spend more time in the weight room to gain more strength and muscle.
Other than that, he's a perfect ball-hawk fit in Shane Bowen's opportunistic zone schemes.
https://www.espn.com/college-football/player/gamelog/_/id/4367181/alex-johnson
29 tackles (20 solo), 5 Ints {37 yards} (led Pac-12), fumble recoveries (1, returned for TD vs. USC); Honorable mention - Pac 12 safety.
Not bad for a UDFA, I'd say
Who happens to be a good player at 6'2", 175); Johnson is bigger, but that doesn't mean he couldn't stand to get into the weight room more often to get stronger.
Johnson is a ball hawk, (a great trait) and I don't think he doesn't have the broken tackle rate that 3rd round Andru Phillips has; I read somewhere that it's over 20%.