To a point you're right, though Harry is far from the only player I know, but in my defence.....
I know what I consider to be serious/ reasonable outside championship winning teams inside out and have done in depth video analysis on all of them. With respect, I don't consider Skerries to be that.
Outside of that, I know few teams of personal interest to me inside out, one of which is indeed Fingallians. Though I can assure you, nobody would refer to me as being from Fingallians!
Again, with respect, there are 32 teams in the championship. I do this part-time. I see most teams, outside of the top eight, once a year at most. Less if they're outside Division 1.
I've seen Skerries twice in three years, last year's quarters and the Brigid's game from 2014.
I could throw marquee names out like most club journalism does, some of which I have notes on, but the tactical nature of the quarter final last year is that nobody really stood out. It was a lot of possession and slow hand-passing, especially when Skerries had the ball, so it was very difficult to really assess player's ability, and I'm not going to comment on players I don't feel I really have a proper concrete context for. Against Brigid's in 2014, Harry stood out as a county standard forward who could win a game on his own given the right ball.
But I do feel I have a reasonable understanding of the system Skerries play, one which I broadly think they can probably implement very effectively against most teams.
So the best thing I can do to do as good a preview is as possible (amongst 15 other games) is take a default of Skerries being the strong favourites and look at how the team I know very well might break them down. There's no bias intended.
But I do think it's noteworthy that Fingallians murdered a side who I think were second in Division 2 last year at the time. In the right style of game, I think they could surprise a bottom half Division 1 side.
I don't think it will happen against Skerries of all teams with their efficient zonal defence, but i think there's a slightly better than the 30% odds the bookies are offering.
Incidentally, I mentioned four Fingallians players