No! First, Ichigo's regular Getsuga Tenshou is white not blue, you may be thinking of when he was blue when he went up against Zaraki. Secondly, he can still do GT after Bankai, but it becomes black and spikey, and also seems to be more controlable. If I remember correctly Hollow Ichigo was over using the attack (it drains his spirit power quickly) when he took over in the Byakuya fight which is what Byakuya is talking about when he says Ichigo was reckless.