Interestingly as the plot thickens, (apart from MET itself), ARV is up the most in percentage terms this morning followed by SUM.
RYM hasn't moved much and even OCA is up nicely. Edit: Now reversed and SUM is up the most in percentage terms. I really think it is SUM.
The other day I worked out the forward PE at 10.7 assuming 15% earnings growth this year and that was, (if my memory serves me correctly at $5.20)
To get up to a similar forward PE to ARV and SUM (14-15) 14.5 / 10.7 x 5.20 = $7.05. This is probably very close to its current NTA.
I would think $7 is the minimum bid for this deal to happen.