Just a suggestion that came to mind while waiting on getting someone to help out with one of the campaign challenges today, and came to a thought about the Forerunner Destroyer commendation. Why is Crawler Slayer and Watcher Slayer required when Covenant Destroyer clearly doesnt have any of the weak cannon fodder enemies as a requirement? Grunts and Jackals both have a high number needed that makes it not feasible to have them included, and the same applies to Crawler and Watchers in spades.
Crawlers have another problem when it comes to their spawn rates. Primes easily outnumber Sniper and base forms combined by a rate of 2 or 3:1 and is the easiest one to knock out when Prime spawn far easier than anything else even when playing on Easy of all difficulties. As for Snipers, they are not seen much at all which makes that commendation almost as hard to finish as Watcher or Grunt Slayer.
Just looking at how some of these commendations just dont make much sense in how they are set up, is it really too much to ask to get the commendations tweaked so that they make sense, or removed completely in the case of the Destroyer commendation?