Easter egg in PoT? (aka. Who the hell?)

[tanithryudo]

So, episode 39, where the Regulars undergo Inui's hell training and threat of Penal-Tea in order to prepare for the Ginka match, in the scenes where they were running laps in the very beginning of the episode, I saw these:





The guy on the right in this second pic actually kinda reminds me of Kabaji. XD




I did a double take and nearly spat something out the first time I noticed it. So who are those freaky people who are definitely NOT Seigaku students or even PoT characters sort of running with the Seigaku tennis team? My theory is that they're self insertions by the animators. But it is kinda freaky...