I have a small head cannon that even though Springtrap is the "youngest brother" he really has this older brother vibes with Nickolas when he was younger. but as the years rolled on. those vibes were kinda flat and became this "almost twin brother" vibe because, he'll, Nick is an adult now. I think he knows how to live without going into hints that will end up killing you -COUGHCOUGHSPRINGLOCKSCOUGH-

*things