I'll explain in the simplest terms possible.

1) Stones has been allied to me personally for their entire existence since they broke off from RA in 2001 and I intend to retire from this game in Stones. We've been building a beneficial relationship for a year now.

2) Laf had an fdp with stones for nearly a year. There were sets where stones was attacked by clans unpacted to LaF. LaF did not honor its FDP and allowed Stones to be tagkilled repeatedly. Signing a DP with Elders means they'll have an FDP that actually gets honored. And since LaF never honored their FDP, why should Stones honor a lowly uNAP?

Hope this clears that up.