Mark my word Wallahi Deni is taking Puntland into the wilderness of development for 10 years.
A friend of mine I was talking to, who works for the FGS was telling me their plan once the debt completion point is reached.
FGS will seek to get 3-5 billion dollars from IMF and other agencies to develop ports and key infrastructure, if Puntland is outside of the scope of the FGS they will not receive a cent. That's why the FGS doesn't care whether Puntland signs it or not.
You are right, they can, but they will not get much. The FGS has the upper hand and I don't think they will upset the rest of the FMS just to please Puntland. This is just my take.