Sure, seeing Shinobi Legions and Shinobi X boxes in the Tose Corporate Guide 2001 confirms Tose's involvement with the Sega Saturn Shinobi game, but more evidence don't hurt none - especially since there are no game staff credits, just the cutscene cast and crew (which could also be evidence). Presenting shared fonts...
Shin Shinobi Den (新・忍伝)/Shinobi Legions/Shinobi X (Saturn)
Ultraman Powered (3DO fighting game developed by Tose)
Note the other visual similarities between the two, most obviously the use of digitized graphics. Is it possible that Ultraman Powered, released first, laid the foundation for Saturn Shinobi? You be the judge.
(And in case you missed it, please read GDRI's interview with Daniel Auld, who worked on Ultraman Powered at Tose.)
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