@CosmicKnight75: Gil is known to have extensive knowledge of magic and the various weapons he wields within Gate of Babylon, thus he could come up with a countermeasure to many types of magic and conceptual weapons that are used against him. Without letting his arrogance get in the way, it is said by Fate's creator that he could easily pick off all the Servants in the Holy Grail War to ensure his victory within a rather short time. But with his arrogance, Gil considers many who oppose him to be beneath him and this leads him to usually underestimate his foes.
A bloodlusted Gil would more likely be willing to unleash Ea and use GoB spammage to occupy Knight Leader while he charges Ea up. Ea's power is a potential life wiper at its full power since it would render a planet inhabitable for all life on it.