User blog comment:St0mX/ Natsu & Dragon slayers aging theory discussion v2/@comment-7418318-20150817055355/@comment-26898341-20150817063129

Yea but Future Rogue had it because he said it himself "he killed him and took his power".

While Gajeel took the Shadow ability during the Grand Games; Well I guess we haven't given it enough time to see but it feels as if.I f they're capable its something they never do in important fights compared to, or unlike Natsu.