I'm OK with Kmet. nfl.com has him ranked at #52 with a 6.34 grade. So he does have 2nd round value and most likely won't drop to round 3.
If the Bears draft him at #43 or #50 or whatever, will he get enough playing time over Graham and Burton? If he does and shows potential for the future the Bears could cut both the FAs and be set with Kmet in 2021.
If they don't draft Kmet or any TE they might have to retain contracts of Graham and Burton in 2021.
There is no right answer at this point in time. OK, maybe there is, but no one knows for sure.
Here's some recent TEs with grades around Kmet's 6.34:
2019
T.J. Hockenson IOWA Rnd 1, Pick 8 TE Detroit Lions r-Junior 6.80
Irv Smith ALABAMA Rnd 2, Pick 18 TE Minnesota Vikings Junior 6.40
Noah Fant IOWA Rnd 1, Pick 20 TE Denver Broncos Junior 6.40
Kahale Warring SAN DIEGO STATE Rnd 3, Pick 23 TE Houston Texans r-Junior 6.30
2018
Hayden Hurst SOUTH CAROLINA Rnd 1, Pick 25 TE Baltimore Ravens Junior 6.40
Mike Gesicki PENN ST. Rnd 2, Pick 10 TE Miami Dolphins Senior 6.40
Ian Thomas INDIANA Rnd 4, Pick 1 TE Carolina Panthers Senior 6.30
SOUTH DAKOTA ST. Rnd 2, Pick 17 TE Philadelphia Eagles r-Senior 6.30
Dalton Schultz STANFORD Rnd 4, Pick 37 TE Dallas Cowboys r-Junior 6.20
Mark Andrews OKLAHOMA Rnd 3, Pick 22 TE Baltimore Ravens r-Junior 6.20
2017
O.J. Howard ALABAMA 7.00 TE -
David Njoku MIAMI 6.80 TE -
Gerald Everett SOUTH ALABAMA 6.40 TE -
Evan Engram MISSISSIPPI 6.40 TE -
Temuchin Hodges VIRGINIA TECH 6.30 TE -
Jake Butt MICHIGAN 6.30 TE