It works because i got the 3 odst vidmasters legit then i modded 7 on 7, annual and Lightswitch and you dont really need to mod brainpan because its easy to get. Check my service record i got recon. GT: Old Mombasa
You can get recon by modding you just have to time stamp them.
If you mod Endure then DEF mod Alpha Site because there is no way you can get Endure without getting the Alpha Site achevo.
The reason is all you do for Alpha Site is get 200,000 points and when you do it legit you get like 600,000 so if you do it in under 200 they will pretty much know somethings up. IE you modded it lol