Let us unlock the weapons with blueprints once we have enough for a 3 star or 4 star version to start. This will give us access to more weapon combos and start us on the upgrade paths. It takes a ton of credits and a coins to upgrade from each stage as it is. Keep the current ability of obtaining the weapons as well so people have options. I personally think its not unreasonable to give us playablity in this way. For example the newest of the new weapons stays the way they are til they have been out for say 6 months then people can unlock 3 star versions by having enough blueprints. this could also increase revenue in terms of a coins and such because they have to start the upgrade path from earlier than just purchasing them outright as 4 plus stars.