I agree. But, if I remember correctly, the Radar doesn't recognize the tempo or meter info in MTC. So, the Giant SMPTE display will help verify that the machines are actually locked, and not just playing simultaenously. MMC should be able to drive the Radar, as well.
So, set the Radar to use MTC, and to send/recieve MMC. That way the Radar can drive Logic, and vice-versa.