I think you've got a few different types of grassy weeds there. I see what looks like different seed heads but can't zoom in enough to make them out. I circled some, any chance you can get pics of them when it hasn't been mowed for a bit and they're mature?
It looks like smooth crabgrass, paspalum like bahia or dallisgrass, heck the seed head on the left looks like goosegrass maybe. Weed salad :/
That’s Kikuyu. Hard to kill, many golf courses just live with it instead of trying to kill it. We have several patches on our fields and it just keeps coming back no matter what we do. I’m sure there’s a way but i haven’t gotten around to it.