Dendros are pretty resilient plants... I currently have about three in my collection... You don't have to worry about "hurting" them because as I said they're pretty tough... The shorter stubs with no leaves serve as a reservoir for holding nutrients and water for the continuous new growth (kind of like a camel's humps
).... So, don't remove those... They're supposed to be there...
You can pretty much repot this plant when you get ready... I repotted one of mine while in bloom (which a lot of folks will say is a big no-no) and it did NOT hurt the plant at all... In fact, it spurred a new growth on the plant... I'll have to take a picture and post in my album for you to see sometime later...
As for your second, plant it is indeed a phalaenopsis... And I actually have one just like it... Coloration and size of blooms is identical! You don't perhaps happen to have the name of this one do you? Mine is just a NOID (no identification) and I would really love to have her name to go in my private catalogue of my orchids...