If someone had sold at a low price, their claim would have transferred to whoever purchased their tokens.
Lol, that would be Dean himself! He told people that BKB tokens would expire, and should be exchanged for the BKT tokens he created. Not having them expire (and possibly buying them back from himself) is just shady.
That also means buying back BKB tokens doesn't make me whole: he broke his buy-back promise, which is what forced me to exchange the BKB tokens for other tokens.
I have to disagree with you on this one. If Dean unilaterally changed the terms of the BKB tokens, you would have a breach of contract claim against him.
If someone owes you money as evidenced by a bond, you cannot sell the said bond for a discount and expect the creditor to pay you the difference between the sale price of the bond and 100 cents on the dollar of the face value of the said bond. The buyer of the said bond can negotiate with the creditor to settle the debt, which may or may not involve the creditor receiving less than the face value of the bond.