That's really interesting. Which pin are you using? And you're on the MDBT42Q with 1v99 firmware?
I actually hooked it up to a scope before posting to check it was doing the right thing, and I see the opposite of you (0v normally on mosi with 4 pulses) so I'm very surprised it's got inverted somehow.
There is the ~30uS gap between pulses as you note, but looking at the datasheet that should be ok.
SPI should normally transmit most significant bit first, so if the lowest bit is 0, that should be the state the MOSI line is left in...
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