Mike I believe will is right its there for protection not to stop the hose from swelling. I see new roadsters at the dealers that no longer have them. Myself I would still use one if possible.
Also as I discussed about the shim replacement. if none had to be shimmed then they realy had no reason to pull the clutch cover. It only has to come off when you release the chain tensioner to lift the cams up for shim install or if you for some reason change the timing chian, guides or tensioner. If non of these had to be done then I would look at the cam cover real close. there are two half moon cut outs in the head that the gasket goes when puting the gasket on one should drop a little permatex in the area to help seal it. When mine leaked it just squoze the gasket ot the side because I missed the alignment.