Board Thread:Naruto Discussions/@comment-1500702-20190701205352/@comment-732150-20190703164125

Look at the things that happened around Minato's arrival. The first thing that appears right after the TBB disappears, in the end of chapter 630, is his marked FTG kunai, by itself, and in the next panel, Minato appears with his hand around it. Minato does nothing else until the other Hokage arrive that could be mistaken for either BFT or FTG.