Based on the SFR published Feasability study, with a Pre tax NPV of $1.3B, shares and options (incl OZL's holding) of 160.3m, discounting the NPV for tax, gives an intrinsic value of $6.19 per share.
If OZL were to go after SFR, then the sp would need to be $4.77 or lower, so that the 30% t/o premium is not above the intrinsic value.