We were discussing that over on the TEG forum. My assumption was...

We were discussing that over on the TEG forum. My assumption was that an independent valuation would be required for the final 20% but others pointed out that the last 20% was picked up in lieu of costs and that it is as likely that the JV stipulates something similar. If it's just a share of costs we're talking pretty minimal cost relative to the market cap.

"... financial advisor to help it respond to inquiriesfrom potentially interested parties". You could twist this to read as a required adviser to finalise the 100% acquisition but I think the more likely explanation is they're there to help with M&A with the interested parties. 

Lastly, increase from 80% to 100% is a 25% increase but I'm not expecting much change as I feel the market is assuming 100% ownership.