lol. Yea, if you are running a VPN to Germany, your bottleneck won't be your ISP 5gb pipe. You can have both ...but let's put in perspective. It's like comparing water (response time) to lobster (bandwidth). You drink water daily, multiple times. You eat lobster occasionally per year.
Yes, but it doesn't really matter what port you do it on. Whatever connection you make will take all available bandwidth it needs. If you have a firehose but you pour a cup of water into it, your water will go through and never use all the space available. Your bottleneck is the cup of water, not the hose. In your case, your bottleneck is you are streaming from Europe so you are dependent on what's going on over there. To further complicate this analogy, your VPN is like running a water hose inside your firehose. If you pour one cup of water into the firehose and one cup into the garden hose, all the water will still come out of the same place probably all at about the same time. The question is how big is your garden hose. It might just be a straw ...in which case your bottleneck is the VPN. There are lot of variables. Anyway, it sounds like you have someone working on it and you'll be in good shape. Good luck!