If MOS Directors unanimously support the 15c takeover (as they do), AGL has no need to up the offer. Before the offer, MOS was on a downward spiral and languishing under 8c. The SP, for any company, always rises to close to the T/O offer price, and then we say it is worth more :) Who knows what it could have fallen to without this offer.
At 15.5c, if it ever gets there, I'm out.