Yep.
The math of it goes like this:
1. In any given ball game, somewhere around 40-60 lads will play in the game. The 26 starters (offense, defense, special teams), a healthy two-deep rotation at some positions, such as DLine, and some other subs where needed.
2. So out of the 2015 roster (last time we went to the Swamp) of 100-120 lads, only 40-60 of them got into the game.
3. The full roster is pretty evenly divided between seniors, juniors, sophomores, and freshmen. But the ones who play in the game, the two-deep, is heavy with juniors and seniors. Naturally.
4. So of those 40-60 who played in the Swamp two years ago, at least half of them graduated by now. That leaves 20-30 still on the team.
5. "27" fits pretty well in the 20-30 estimate. In fact, it's just a tad on the higher end of that spectrum.
Bottom line is, this kind of factoid is probably true of just about every team in college football today in every home-and-home series played.
Number of 2017 Ohio State players who have played in Michigan Stadium before? Probably 20-30.
Number of 2017 Stanford players who have played in LA Memorial Coliseum before? Probably 20-30.
In short, this is a meaningless factoid. It's not surprising, it's not informative, and--once you scratch a little beneath the surface--it's not even particularly interesting.
It's just how college football works.
Butch has got to get a better statistician / talking points writer.