Except even that wasn't the first time he was summoned anyway - he had been summoned numerous times back before the Calamity in 1.0 - it seems he was the very first Primal to be summoned (he shows up with Titan in 1.0's opening movie bursting out of Lake Silvertear after all). One of the very first times he was seen (and the first for players) is that the player encountered him with their Path Companion as part of the 1.0 Main Scenario quest 'Lord Errant'.
It was this particular encounter where the Echo was discovered to protect against Primal influence, although that encounter the player's character did not actually fight Ifrit at all, they simply beat up some of the tempered unfortunates until they "lost the will to fight" and Ifrit's equally tempered amalj'aa summoners once it was discovered the player and their Path Companion were immune to tempering, before Ifrit ended the encounter himself and went on a long "reason you suck" speech and declaring that the "Paragon entreated that I spare you", and then after demanding the two adventurers declare to him "that they would refuse to summon another", the scene ended and the amalj'aa basically kicked the player and the Path Companion out of the Bowl of Embers back out into Thanalan (incidentally it was not known at that point that the 'Paragons' and the Ascians were one and the same, that connection was not made til ARR).
Also, in ARR's encounter, one of the npcs you can speak to in the cell after being captured by the amalj'aa tells you that he's dug a tunnel out of Palga'than back to Thanalan that could potentially be used to escape, but that if they all tried using it it would alert the guards so he intreats you to escape by it and return with reinforcements, pretty much giving an actual reason the player fought Ifrit with others and not just themself (an npc that appears in Camp Drybone likewise gives you access back into there afterwards).
And it's frequently mentioned in game about the Warrior of Light often drawing on "Echo-blessed" adventurers to help them in Primal fights, so it's pretty clear most Primal battles are not fought alone.