Ultraman Zero links that Imitation Belial Episode from Ultraman Taiga could be related to Devil Splinter. But before that, why did I come to this topic? Well Ultraman Z is told to do sit ups so many million times and Z was almost dead doing that.
Next Ultraman Z asked to do push up so many million times. Z is shocked. Zero tells him that Titas does that almost everyday. Then Z asks him who is he. That is where the topic switches to Taiga and Tri-Squad leading to Imitation Belial episode.