I'm fairly certain you will end up pulling a lot of sod up with a landscape rake.
He also must have gauge wheels.Heavier is better but will mean it will dig deeper into the ground if that is a concern.
You need to take into account you were picking rocks out of loosened soil you spread. In the OP's case he is working with soil which has been compacted from years of sitting, walked on by livestock and having been driven over while mowing.I cleaned up about an acre of glacial till that I spread out to level my yard with a rake. It was full of rocks from gravel to about a foot in diameter. It works but it takes a lot of passes and you need a large area for your windrows. I took out about 4 yards of rocks but I must have spent 15-20 hours at it.
I had no issues with bending tines or stalling my 7510 however it takes a lot of time and anything bigger than about 8” need to be loosened with the bucket before the rake grabs it. Bigger rocks end up getting under the rake and you drop everything so having someone walk along and grab those rocks saves a lot of time.
I don’t think there will be much if any grass behind by the time your done. The angle of attack makes all the difference with the rake, a small change in the angle make a big difference and I found using a chain in place of the top link allowed the rake to even out rough spots instead of amplifying them like it did with a solid upper link. I think someone on here gave me that last piece of advice.