Should I delete busy box, superuser, mod manager etc?
If the goal was to take your phone back to stock, you've succeeded. Now just push manual updates till you get to the stock FroYo ROM and have fun. It might be worth it, for S&Gs, to see if RSDLite will see your phone now, but do NOT try to flash anything with it; it's just to confirm that if you have to you could.
Repeat, do NOT flash anything with RSDLite. This step is to see if you now could if you had to.
If you still have SPRecovery, then you're gold. Just download the BB ROM from Pete's website and flash it in. If you no longer have it then you're probably going to have to wait till DMUpdater is released or reuse Easy Root. As you can tell, it didn't like your phone all that well the first time, and I don't like how the app came about. Between stealing code and, well, this post over on the DroidMod front page...
Who turned out the lights? | DroidMod.org
The important bit is halfway down.
If RSDLite won't recognize your phone, it's just useless-to-you code on your computer. If you have SPRecovery installed on your phone, just use that to install Bugless Beast on your phone.
no root=no custom recovery, i.e. SPRecovery/CMRecovery on phone. AS fbm said, if RSD Lite still won't see your phone, then your best bet is to wait on the DroidMod team as they and they alone have been the ONLY ones to produce a flawless 'root helper' type of app for your phone. SPRecovery_ESE81.sbf will NOT work on a 2.2/FGR01B phone. There 'might' be a way to downgrade to 2.0.1 using the stock recovery console, but without having RSD Lite to fall back on, I will not recommend it.