I'm no expert either but until I started using K-lite from First Rays I used to get rot on 1 or 2 plants every year.(I hope I didn't just jinx myself)
If the new shoot is coming out from the fan with rot it won't survive if you cut the fan entirely out. If it's coming out from the other side, off an older growth, it should survive.
If the new shoot is coming off the rotted fan one thing you might try is making a paste with alcohol and ground cinnamon and slather it all over the rotted fan. That will stop any spread of the rot. The plant will look like s#$t for a year or 2 but the existing roots would still be able to feed the new growth.
You really have nothing to lose at this point. I've saved several and lost a few, no guarantees.
Bill
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