*shrugs* Okay. Whatever approach makes the most sense to you. Sounds like you have one that's well-thought-out and considered!
For me, when I read a simple instruction to "post your top 50 games", I interpret that as a simple call for a favorites list, not an academic exercise in professional games criticism. That's just me, I guess.
Your approach is how I started when Smeags first started this event years ago. After a couple of years it developed into the insane method I have now!
I kept finding new games I played that year that I wanted to add but also remembering old classics I wanted to keep and didn't have a way to sort which ones I actually wanted to have in the top 50. So I ended up with my current method!