RE:TME & RYGI don't think your conclusions are necessarily correct.
My understanding from talking to the management teams is that It was Dundee that wanted the RYG, EAG and CRG deal conditional on the OSK investment which makes sense since they are the largest shareholder of those three companies. OBM and OSK had to offer this to get Dundee to agree to the deal and lock up. It's also why those three companies are sharing one arrangement. If they don't get Temex now they will go ahead and develop Windfall and maybe participate in the inevitable dilutive financing that Temex will have to do to avoid bankruptcy (assuming no buyer steps up). Temex had no big shareholder to negotiate a lock up so there was nothing to bargain for.
It won't be the end of the world if Temex doesn't get done or gets another bidder. In the near term it's less dilution for new OBAN and higher cash per share. I even own some Temex now in case it does get another bid but I think the proposed deal will likely close.
Dissent rights are common in all plan of arrangements and are usually limited. It allows a shareholder to argue in court that they should get "fair value" instead of the consideration offered. In a deal this small, I'm not sure it would be worth the legal costs to pursue but there will be more information in the circular when it's filed.