The natural contenders to provide both defensive solidity and an attacking threat down the flanks are Stephen Carr, Christian Ziege and Mauricio Taricco. Unfortunately, for long periods of time, the boss has not had even two out of three available for selection.
It is a style of play that served us well last season when Ziege and Taricco patrolled the wide areas. Sunday was the first time that Carr and Ziege operated in tandem in a competitive game.
Glenn reasoned after the win over Leeds that the benefit of the system is more attack-based than defensive.
"I don't think that shape necessarily makes you more solid," reflected Glenn. "What it does is give you options offensively and it is something we've been thinking about but often haven't had the personnel.
"There will be games when we will be playing with two banks of four like we have played for most of the season. It's what you're playing against and what you've got at your disposal. We are now getting everyone fit - Simon and Jamie coming off the bench shows that we have got a little depth to the squad.
"Since I bought Christian here I never really had the opportunity. When you've got the right people it does give you some options.
"It doesn't mean we'll keep that shape next week - it is whatever feels right on the day."
Glenn added that the wing-back system is more conducive to a passing style and also allows him to free up Gus Poyet to get forward from central areas.
"It gave us a platform to pass the ball well and allowed us to cause them more problems than we have done previously with two banks of four. It's very rigid sometimes when we play that way unless we find a real fluency.
"It allows Gus to play his natural game, which is just off the front getting forward, and he put in a good performance for us."
Glenn finally had the personnel available to play wing-backs on Sunday against Leeds - but says he will not necessarily deploy the same system every week.