If a suspension is the only reason a player makes the team he probably sucks
... because a player that was cut by one team has never turned into a successful player on another team?
Each player is an asset. For math's sake, let's say each player drafted/makes a roster has a 25% chance of becoming a starter.
That means for every 4 players, 1 will become a starter. If a team has the ability to hold onto more assets than another team, even for a short amount of time, they are statistically more likely to have more starters than another team.
4 players = 1 starter vs 5 players = 1.25 starters
In this situation while we only have an extra asset for a short amount of time, it still increases likelihood of choosing the correct player. Between Robinson, Stewart, (possibly) Anderson, and maybe Mcguire with a short term IR or PUP. Our team size increases by 4 players or 8%. If you used our 25% example that would be 1 additional starter. This also gives us the added bonus of having injury insurance. If someone goes down we can choose from our own reserves rather than another teams who we know little about.
I understand short term you don't want any of your players suspended, but long term, on a team that's not going to win the superbowl this year, I don't see how this isn't a competitive advantage.
