The devs thought his voice acting was so good that they moved him into EA ahead of time. His intro can be placed at any waypoint, also. It is a good thing they put all the tadpoled characters around the crash site in Act 1 as running into Gale in Baldur's Gate itself would have felt very contrived, I think.
Are we absolutely sure he even has a tadpole? He is the only one of our companions we never have a "telepathic tadpole related exchange" with.