CCV Hose Collapsed-and Need Help Attaching oil separator Hose

[Explorerlyon]

2003 BMW x5 4.4

1. One of the CCV hoses completely collapses when the engine is running. When I pull the dipstick, I can feel a lot of suction. I plan to replace the CCV diaphragm only (edit: and hoses). Given the hose is collapsing and has lots of suction, should I be looking at other issues? The hose is very soft so it doesn't take much to collapse but concerned there is too much suction. Any reason to replace the entire CCV instead of just the diaphragm?

2. Hose #9 that attached to the bottom of the oil separator I wanted to check and replace (see lots of posts where this hose goes bad or gets plugged). How in the heck do you get to the connection where that hose attaches to the tube back to the oil pan? I cannot even see the clamp it's so hidden.