Fantasy Upside
Seals-Jones started last season on the practice squad. He was promoted to the regular roster in late September. In his first two games, Seals-Jones played only on special teams. In his third, he played one snap on offense and failed to make a one-handed catch on that play. He was inactive for the next four games, but then became a more important part of the Cardinals offense for the rest of the season.
Seals-Jones caught two touchdown passes against Houston, the first of his career. In the last seven games of the season, he caught 12 passes for 201 yards and three touchdowns. Four of his 12 receptions gained at least 20 yards, a tally which equaled the combined production of every other Cardinals tight end for the entire season. Expecting new coordinator Mike McCoy to make heavier use of the tight end position than former head coach Bruce Arians did, seems very reasonable.
Fantasy Downside
Seals-Jones is a college wide receiver who was converted to tight end. That being the case, he still needs to improve as a blocker so defenses won't be able to scheme to stop him as a receiver knowing that's why he's on the field.
2018 Bottom Line
As a receiving tight end, it is obvious Seals-Jones creates matchup problems for defenses. Since you won't be drafting him as a front-line player, it's hard to argue against securing his services as a TE2 with some upside.
