dap tops $500 per tonne, page-4

Can anybody explain me:

There seems to be a difference in time in the charts of DAP and RP, Dap has a peak from july 08-march 09 of about $ 1200, versus RP , only 6 months later in jan 09 $450 for about 3-5 months.

So there seems to be a delay of about 6 months between DAP and RP pricing, although RP is a substantial part of DAP as far as I understood.

Questions
1) Is there such a delay, if so why
2) Is there a kind of multiplier between 2 materials , like fe DAP $ 1200 versus RP $ 450 = 2,66
If so, with Dap reaching $ 500 now, we might expect RP within 3-6 months, based upon current DAP pricing RP to go to $ 188
3) So the Maroccan pricing $ 110 ,acc to Saracen, seems to fit to the DAP pricing of last months 09, before more or less the big increase from Jan.
In case the delay exits, we just started to move upwards and might expect a party soon to confirm RP pricing $150-188.
Moreover DAP has just begun to start to rise, so one can expect that the critical $ 150 obstacle where most people are speaking about , can be taken soon.