Originally Posted by Tinytom

Train Chest with Delts.

A lot of chest exercises involve delts to some degree so it makes sense to train them all together.

I wouldn't train tris with Chest as I would be weaker on training shoulders later that week.

Also I like doing lots of close grip work for triceps so by doing chest first I would feel like I couldn't go as heavy on my close grip because the chest would be pre-exhausted and might give out before triceps do as chest is an ancillary muscle in a close grip press.