College FAs are filler at best
Not to say they never pan out, but seriously this is a very thin field. Read a recent article listing all these guys who were free agents that made it to decent NHL careers. Yes there are some, but the punch line is there are about 10 guys mentioned. Over many years. So yeah, maybe one a year will pan out to be a reliable player and sometime all-star for the entire NHL. Not exactly the odds you want to rely on. These guys may get more opportunity than other teams for VGK, but I still believe at best they are healthy scratch type players at best, career AHL/ECHL players on average.
Anyone who has watched college hockey (former DU season ticket holder here) can tell you the game is just not the same as the pro game. The intensity, the speed, the pace at which most players play is not even close and its done over a short season with relatively few games. The few kids who are drafted and playing in NCAA are light years ahead, think of college basketball one and done players, they are stars from day one and last 2-3 years as clear cut team leaders before they leave. A few that are later round picks clearly aren't going to pan out as NHL players and they stay all four years and often don't ever get a pro contract and try their luck in Europe or go get regular jobs. The free agents, well its usually 2 or 3 players per team who are late bloomers. They play the team's system well, the coaches trust them with lots of tough ice time, and they show competence enough that they can make it to minor league hockey.