Nope, not what I wrote, implied, nor meant.
On the other hand, you said that 2, the member of the set of even numbers, would be different from 2, the number. You are completely wrong on this.
You are also completely wrong that a set is the union of its members.
Furthermore, the rule that collects the members into a one set is not considered (it is used as a hidden assumption) and as a result each member can be cut out of the set but still be considered as its member.
2 is first of all an independent element. Also it can be a member of some set, but then it is a pert of some set, and being a part must not be ignored.
I know that by get 2 as the same object whether it is a member of some set or not, you think that you are using mathematical generalization.
So let me tell you something about generalization in general.
Generalization in general is the ability to get the common without losing the details.
Actually, more you get the common more you get the details, where the common and the details complement each other in more complex (not complicated but complex, which are not the same) and interesting ways.
For example: by using invariance\variance complementation I am enable to understand the Multitude as a result of this complementation (something that is beyond the ability of the traditional point of view). Furthermore, I can distinguish between being a member and not being a member from finer resolution which is complemented by greater generality.
This is the organic paradigm of the mathematical science, which does not ignore whole\parts relations.
You are actually use the organic paradigm when you distinguish between {1,2,3,4,...},{2,4,6,8,...},{2,3,5,7,...}, etc.