Webway and reserves

I had a question and I think I know the answer ... but if you move forward and deploy a webway on turn 1 all your reserves still have to make the appropriate reserve roll before they can come through it, correct? I know it states that you can hold units in reserve if you wish and I believe that they otherwise "abide by reserve rules" so I would think that would mean that if you didn't roll for the unit to come on until turn 4 it wouldn't even if you have had the portal down since your turn 1.

Can this be confirmed or clarified if this interpretation is wrong?

Thanks!

As they follow the reserves you still must roll. That said, the portal is just another board edge effectively... You don't have to use it. Also, regardless of it being on the table, you still roll for reserves and if you are successful the unit comes on from the board edge