Not that I necessarily support an LRT DRL, but even in that scenario why would you need a 6-car LRT? Rolling stock on the Frankfurt U-bahn or Cologne Stadtbahn can hold at least 200 per train (250 for some), and regularly run in couplets or triplets, including on their at-grade, street-median portions. Supposing that the line will see 25000 pphpd at peak even on the surface portion or that they somehow cannot/do not short-turn (unlikely), it means one 3-car train (75 m long) every 1.5 minutes, which is close to the peak street-median operation frequency on the Frankfurt U-bahn. (If Eglinton were to still be built as an LRT, it might even make sense to interline some Eglinton trains down this light rail version of the DRL, further decreasing the redundancy north of Eglinton. But now that's just dreaming.)
200 is generally the crush load, but yes you are right. It can be done, however, it's far from the optimal configuration.