Hey Solomon, long time no talk. As mentioned previously that gar was in a 600 gallon comm tank with Asian aros & other assorted fish, and the owner fed heavy to keep everyone from killing each other. His Asian aros wouldn't eat pellets with any type of consistency so he also fed tilapia, prawns, salmon, etc, and I'm sure that gar got his share of those foods as well.
Not my recommendation as far as feeding, or keeping fish in general, but it wasn't my tank, or my call. I can only offer advice. As far as obese fish go, I see photos of obese fish posted on MFK every day. Some people just don't get it.
I think that the main reason for gars, as well as many species of fish being more difficult to train on to NLS is due to their density/firmness. There is no argument there, but IMO the extra effort is worth it.