WatchfulElm
Former "Domi a favor"
Although I have already told him a number of times, it seems it hasn't sunk in yet. Your analogy is good but let me modify it to make it more related to what I was trying to explain...
so taking your description, with my edits in bold...
Imagine that you are 23 (or pick any age over 20) and have met two females. One is your ideal image of what your wife will be like and you can imagine the future with her. However, she is just 16 yrs old. Too young, needs some maturing. A few years before you can date her assuming she grows up to fill in to her potential.
The other is someone that you cannot imagine spending the rest of your life with but she is free to do anything you want whenever you want at any time of the day or night and she's not so bad that you have to hide her from your friends.
One is Galchenyuk. One is DD.
Edit.........Eller is the girl who you call when none of your friends are available to go down to the local pub and grab a beer.
That should do it. If that explanation isn't enough...I have no idea what would.
So much explanation just to say that one player (DD) is ready to assume his role, while the other one (Galchenyuk) needs to gain more experience before assuming the same role, despite having more potential on the long run.
Effectiveness >> Potential
You own a Honda and you just signed a contract to buy a Ferrari that is still at the factory. Which one will you take to go to work this morning?
Not very hard to understand.