Rowlett showed glimpses on Friday of the team it can be.
After dropping into an early hole, the Eagles made a surge in the second quarter to stay within striking distance.
But McKinney ultimately had too much, as it was able to pull away for a 35-9 victory at McKinney ISD Stadium.
Rowlett completes its non-district run with a 0-3 record, while the Lions improved to 2-1.
McKinney came out firing, quickly moving down the field and taking a 7-0 lead when Sampson Nazarko broke free for a 21-yard touchdown run.
The Lions then hit the Eagles with a surprise with an onside kick, which they recovered.
That led to another quick scoring drive, with Nazarko finding Xavier Filsaime on a 33-yard touchdown pass to open a 14-0 cushion just two-and-a-half minutes into the game.
McKinney padded that advantage early in the third quarter when Bryan Jackson found the end zone on a 13-yard run to make it 21-0.
Rowlett refused to go away and put together its best drive of the game, moving 59 yards in 10 plays, with Devonta Crow capping it with a 4-yard touchdown run.
Just before halftime, the Eagles put together another sustained drive, with Jacob Martin kicking a 40-yard field goal to close to within 21-9 at the break.
Unfortunately for Rowlett, that was as close as it would get.
The Lions took advantage of an Eagle turnover, converting the miscue into a 19-yard touchdown pass from Alec Griagosian to Jeffrey Pearson to push the advantage to 28-9.
The McKinney defense put the finishing touches on the night, as Damon Youngblood picked off a pass and returned it 40 yards for a touchdown to provide the final 35-9 margin.