If I saw your pictures correctly, you don't need to repot right now.
Dendies like to be left alone as long as possible, and when you do repot, do it into a dinky a pot as possible, picking a size for the root-ball, not the top. You will then want to set the pot in another pot to help hold it up. It is just the way with dendrobiums.
Another thing about these grocery store type dendrobiums is that they will loose their leaves on their older stems in their third year, sometimes their second while growing new growths. They are translocating their foodstuffs from old to new. However, don't ever remove canes from a dendrobium unless it is diseased or absolutely dead, because it can and probably will bloom from older canes too. Side benefits!
Hope this helps
Take care and may all your orchids bloom like crazy!
Rex
aka POLKA
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