IMO all three of those fish are territorial not aggressive. The LMB should be okay with shear size and as long as their is enough space seems okay by me.
it's guarrented, that a lmb will eat feeders, because if they are wild caught then that is what they have always eaten, other smaller fish, the tricky part would be trying to get native wild caught fish such as them, to eat dead prey such as pellets, and if by any chance feeders did not arouse there attention, then your normal, creepiey crawliey, or worm will. also, a wild caught lmb, form your area, would be used to much colder, temps than say, one in florida, so the temp difference would be very different, for them and for tropical cichlids. persoanlly, i woulnd't try the combo
I can tell you that my Jag never really liked my Oscar (sadly departed). I personally think he enjoyed beating my Oscar up... Nothing much I could do about it