OK. If I am confused, (which is likely without having read everything and I am sorry for that) and if the shares being issued are actually the PDX shares, then it appears that you would get something for nothing. The EXBX shares are the shares that are trading. Newly issued shares by PDX wouldn't trade. They could be registered and could begin trading after the filing of an SB/2 and all that goes with that (I have had fun with that in the past). Then PDX could be traded under some new symbol yet to be assigned.
The EXBX shares could continue to trade.
If this is the case, then the EXBX shareholders would basically receive a small dividend of PDX shares and would still have their EXBX shares which would likely be the equivalent of what they are today without the preferred shares and without some of the debt.