Don’t want to pop into a thread to just say “I dunno”, but… I dunno. =P
In all seriousness, though, I studied Nakama at uni, and yeah, I guess TextFugu does roughly cover Nakama 1. I actually started on TextFugu AFTER we’d already started on Nakama, as a form of self-study to make sure things got hammered in place. I also studied from Japanese for Busy People for good measure.
If you want to try skipping to Genki 2, then sure, give it a try. I don’t expect you’ll be too lost, though it’s possible it may use some kanji or vocab you’ve not learnt before. Figure you can just ask questions here to fill in the gaps.