'Flagship' kind of means anything marketing want it to. 'Flagship' compared to the G70? Build quality, action quality, number of Keyboard Parts, color touch screen, VH, and a host of missing OS features still keep the G70 as "flagship', if they continued to make it.
But they don't.
So, whatever else is currently their top model gets touted as that. Personally, as I have said before, price wise, the BK-9 hits the MOTL price and feature point compared to most other lines. PA3x's, T4's and Audya's all come in at least $1000 more, whereas the BK-9's 76 puts it into a market segment few others address.
I simply think, for today's economic reality, Roland choosing to first concentrate on the sub-$1000 market with the earlier BK's, and now the MOTL makes sense. Hopefully, if sales of the BK-9 prove robust, Roland might make a foray into a TRUE 'flagship' in a year or so. Something to give the T4 and PA3x76 a run for their money.
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An arranger is just a tool. What matters is what you build with it..!