As far as I could tell, we've never actually seen someone dispel Shen's illusions other than the forced dream state. The only exception to this appears to be whatever Eisheth did to Shen back during the S.I.N. infiltration via her own powers allowing reality manipulation.
Elijah never even attempted to dispel Shen's illusions, nor did he at any point ever get close to doing so. I'm not even certain they can be dispelled without specific powers or Shen personally doing it. The flickering that resulted in Elijah noticing they were illusions was likely a failure on Shen's part caused by Elijah turning around at an unexpected time, not Elijah dissipating them or overcoming them. It's absolutely true he was acting emotional and failed to use his ability to sense Monster Power properly during the fight, but I strongly doubt that had any effect on the strength of the illusions, just his ability to discern what was hidden behind them.
Elijah never even attempted to dispel Shen's illusions, nor did he at any point ever get close to doing so. I'm not even certain they can be dispelled without specific powers or Shen personally doing it. The flickering that resulted in Elijah noticing they were illusions was likely a failure on Shen's part caused by Elijah turning around at an unexpected time, not Elijah dissipating them or overcoming them. It's absolutely true he was acting emotional and failed to use his ability to sense Monster Power properly during the fight, but I strongly doubt that had any effect on the strength of the illusions, just his ability to discern what was hidden behind them.