Why does Denctash insist that the Turkish parliament should vote after the referendums? Don't you find that such an order is very absurd?
Here's a detailed analysis I guess for Turkish goverment wanting to vote after the referandums.
If the Turkish parliament is required to vote after referandums, then we have the following possibilities.
1- Both or one of the sides say "No" to the plan. In this case, the Turkish parliament doesn't even need to discuss the plan in the parliment, since the plan is not accepted. Turkey is not harmed. (Good)
2- Both sides say "Yes" to the plan. In this case, the Turkish goverment will be able to explain to people in Turkey (especially military and people who think north Cyprus is being sold) that since both sides agreed on a solution, it's absurd to stop this. Afterall, Turkish hardliners claim that Turkish army is in Cyprus to protect T/Cs, and if T/Cs vote "Yes" referandum, then these people won't be able to say anything back. So it's very likely that Turkish parliament says "Yes" as well. (Good)
Now, if the Turkish parliament is required to vote before referandums, then we have the following possibilities.
1- Turkish parliament votes "Yes" and T/Cs votes "Yes" and G/C votes "Yes" or "No"(doesn't matter). In this situation, no matter what happens, Turkish side is in good shape. (Good)
2- Turkish parliament votes "Yes" and T/Cs votes "No" and G/C votes "Yes" or "No"(doesn't matter). Although unlikely, in this case, T/Cs will be blamed most. Turkey will be in good shape. (Good)
3- Turkish parliament votes "No" and T/Cs votes "Yes" and G/C votes "Yes". In this case, Turkey will be considered a country blocking an agreement, not good. (Bad)
4- Turkish parliament votes "No" and T/Cs votes "Yes" and G/C votes "No". In this case, Turkey will be considered going against T/Cs wishes, not good. (Bad)
5- Turkish parliament votes "No" and T/Cs votes "No" and G/C votes "Yes". Although unlikely, in this case, Turkish side will be considered blocking an agreement. (Bad)
6- Turkish parliament votes "No" and T/Cs votes "No" and G/C votes "No". In this case, nobody wants a solution, no harm to any specific side. (Good)
As you can see, it's much logical for Turkish government to ask for referandums first before making a decision in the parliament both domestically and internationally. That way, Turkish government will have much flexibility in trying to come up as the "good side".
To sum up, I don't think that Turkey is bluffing. If T/C and G/C people say "Yes" to this plan, I don't think that Turkey, or any other country, or even the politicians in the north and south can block it.