On this episode, right before the team of 5 becomes Susanoomon for the last time, they raise their D-tectors. When they do so, their are 6 of them (5 + Kouichi's D-Tector makes 6). However Kouichi's D-Tector becomes non-existant after he gives his spirits to Koji. But, to see this you are going to have to pause it or just slow down the film of it. If you also notice, all the D-tectors are held in a right hand...if one of them had to hold two, where did that last right hand come from?