Didnt have enough characters.
Whatever, I’m now on mission 7 and have seen that I completed only 4 instead of 6 on legendary. So I looked for the stats in the spartan stats and really, Infinity and Reclaimer somehow didn’t count, altough when I check the missions themself, it tells me that I completed it on legendary.
Yup, I just beat Legendary but it still says I only completed 4 missions. No Mark VI for me. =(