They are both FINE! No need to gain. A little lacking in muscle tone but that will come with work.
Seeing your hayfeeder....lot of waste. Have a look at roundbale slowfeeder haynets. They make them eat little at a time, all the time, very natural, and no spoilage, no sticking head in the bale and inhaling all kinds of dust(heaves!). Lots of folks here on the forum use them, the big ones or, like me, small ones.
One thing I would like to add to their diet is flaxseed. Makes them shiny and gives them the omega fatty acids lacking in a drylot diet. I use Omega Horseshine.