Yeah John and Shaun left TBS in 2003 and started Straylight w/Will Noon and John's sister. I'm kinda surprised you didn't put that together...Nolan has a pretty distinctive voice.
I knew both bands. I was only like 12 when TAYF came out, and 13 when Straylight Runs first release. I haven't listened to either in a few years so I never remembered to realize it. I'll definitely have to get back into TBS' old shit now.