Is there a limit to the LDs you can get from the LD missions? I've been completing a few but I only get the 7 credits rewards. I read somewhere you can only get the non-Arcade LDs in the missions but I was able to get W4R LD, Bapho LD, Rekt LD, Space Hans LD, and Fomalhaut LD from the LD missions before.
In the current system we have first wave legendaries in missions and second wave legendaries in Arcade. What you listed were at one point available in missions when only the newest season's LDs were exclusive to arcade. See https://www.urban-rivals.com/game/gamemodes/arcade.php for who is available and where in Arcade, and all the rest are in missions (which you should have all of since you're getting credits instead.)