You're likely referring to this line from the film:
Cassian: Melshi, Pao, Baze, Chirrut, you'll take main squad, move east and get wide of the ship.
Rogue One: A Star Wars Story (2016)
But Melshi and Pao are identified in the Rogue One Visual Guide as members of Alliance Special Forces, rather than the infantry grunts seen in Twilight:
At Captain Andor's orders, SpecForces Infiltrator Sergeant Ruescott Melshi is placed in command of the Pathfinders that infiltrate the Imperial compound on Scarif.
After sneaking onto Scarif in an Imperial shuttle, Pao and his fellow SpecForce commandos hide in the jungle canopy.
Several other members of the infiltration team are named in the Visual Guide:
- Arro Basteren
- Farsin Kappehl
- Walea Timker
- Jav Mefran
- Stordan Tonc
- Eskro Casrich
- Yosh Calfor
- Rodma Maddel
- Taidu Sefla
- Serchill Rostok
All of these (except for Maddel, who's an intelligence scout) are explicitly identified as SpecForces operatives, not the sort of people we'd expect to find in Twilight.
What's more, the novel Twilight Company reveals that Twilight was some distance away from the events of A New Hope, which occurred only shortly after the events of Rogue One:
Private Hazram Namir had been in his bunk disassembling and reassembling a DLT-20A blaster rifle when word about Alderaan came down.
Days later, when word came of the destruction of the Empire's planet-razing battle station, Namir was manning a trench in the honey fields of Vir Apshire.
Battlefront: Twilight Company Chapter 32
Considering this, it's doubtful that Twilight was present at Scarif.