New pony

For me personally, while I have studied basic equine nutrition and have a good idea about what horses need(often recent research has shown that's different to whats found in older material btw) and of balancing nutrition, etc, I don't want to spend the time and tedium analysing everything - and you also often can't do that accurately just from lables and manufacturer info I have found - and I also like having a qualified equine nutritionist on call to ask any specific questions of, and being kept up to date with research and stuff, with very little expense. That's why I sub to feedxl. I also let my clients use it- many of whom end up signing up after a play on it!
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Can you have your vet do a fecal test to check if has worms? And if so, what kind(s)? That would allow you to treat more specifically.

He'll do fine on the timothy. If you get a small mesh hay net for both the pony and the TB they may both gain weight. Because they are forced to nibble at the hay it slows them down which in turns slows down how fast the hay goes thro the gut. Ie better digestion. If you build a big triangular shaped feeder in the TB's stall and scatter his pellets on they will last much longer than when put in a pan. Again this improves digestion. The faster in, the faster it's manure.