Board Thread:Questions and Answers/@comment-24423762-20150602063532/@comment-44061-20150602133239

I dont think its ever stated how Dordoni knows about Ichigo's hollowfication. It also isnt all or even most, its barely some of the Espada that are surprised or caught off guard. Namely Ulquiorra and Grimmjaw. Grimmjaw didnt even really know what it was and Ulquiorra was the only one really surprised but even that lasted a split second, mainly cause he didnt expect ichigo to really have anything so close to what they are. Its a bit confusing but its not like there was any information gathering on the shinigami or ichigo. It was pointed out that he was an enemy and they took it from there, even if one had info they arent likely to share it with another.