JD Pride is a terrible example. The idea that I was refuting was that Coaches ask College Coaches to do them a favor and offer a kid. JD Pride might not have gotten an offer from his ability alone (hard to say, he's a FR), but it certainly wasn't out of a favor to his HS coach to get in with his HS coach. If your theory is correct, Brew did it to try to pursuade Pride's friend. He didn't do it for a favor to anybody. Assuming that theory is correct, Brew did it in an attempt to make MN more appealing to Seantrel. That example isn't an apt comparison.
Ryan Grant...I don't know, it's a close call. I think he was a borderline prospect. He has played quite a bit here (not much last year), but he started about half of the season last year. There are plenty of scholarship athletes at every school who contribute less than Ryan Grant. He was All State for the best program in the state. He is local, good grades, good kid...a top 10 player in the state. He had gone to a lot of Big 10 camps, so it's really a tough call on whether or not he would have been offered if he had a different last name. We didn't offer his little brother who is a TE at North Dakota. Did Mike Grant only love Ryan enough to ask Brew for a scholarship offer? It's conceivable that him being a Grant played into the decision a bit, but that is wholly different than offering him as a favor to Mike Grant.
I have no doubt that Coaches will sometimes factor in other things when offering a player (quality of their program, friends with recruits, etc.), I don't think it really happens where a HS coach asks a college coach for a favor scholarship offer. The college coach might offer people he wouldn't to try to get an ins with a recruit, but that's a completely different hypothetical.