Thunder had a VERY different original post + you changed from "Gnar's maintains the same power level" to "lost some of the power he had before". Your edit makes my post ... useless since we are agreeing with each other.
i want to say one of the reasons that there's not a lot to discuss with your first two post is that they are sort of... tautologies. You should:
1. Win your lane
2. Win all the teamfights
While that's a great way to actaully... win the game. It's not exactly any new revelations 
More interesting stuff would be like:
1.
TP/Ignite vs. TP/Smite. Pros/Cons. LCS like Smite because it allows stronger objective control, and Skirmishers Sabre really isn't THAT amazing unless you're Irelia/Volibear/Warwick. Plus Smite is better in 2v1 lanes.
But i think Ignite is WAY better than Smite for most soloQ. But, maybe there's really efficient jungling routines where you can farm crab/gromp/golems really effectively. Maybe Smite is better if you're a tanky melee (Nasus) against a pokey ranked (Gnar) if you're on Blue side because the Gromp buff is soooo good against autoattacking opponents.
2.
Are there more champs that could run TP/Ignite or TP/Smite? Shyvana, Fizz, Hecarim are all pretty "obvious" but i really think that there's more than just those
3.
What's the merits in double the "push fast, double sword" strategy, similar to Morgana mid. Morgana mid will often push VERY hard the first few levels, forcing her lane opponent to spend a much of mana counter-pushing. Meanwhile, she'll base at level 3 or 4, get a 2nd Dorans ring, then completely wreck the opponents. i've seen an Enemy Riven who did a similar strategy (with 2x Long Swords).
4.
Dragon vs. Top Tower?
Just last night i was in a very strong position against a Renek (who went Hydra + Flash/Ignite). i was roughly 10 CS ahead. i did a teleport botlane, picked up 1 kill + saved 1 life + got dragon. And i didn't have to lane against a high-damage Renek who had Ignite up. Renekton was able to get top tower and FOURTY CS. From there, he was able to roam. What were the pros/cons of the strategy? 40 CS is too much to give up, since i went from dominating the lane to being unable to lane. But maybe, i saved botlane from not being able to lane and completely ballsnowing.
Was part of his roams only successful due to my team not being diligent (eg, his first roam was successful even though he walked over wards and i pinged him the whole way down to midlane).
5.
How will the upcoming tower changes modify splitpushing? It'll be much easier to dive inhibitor towers. Does that make teamfight tops even BETTER since they'll be able to close games out faster? Or does it make champs like Trynd/Jax better since splitpushing is a much more serious threat when they get ahead?
6.
What's some good toplane + jungler or toplane + midlane combos. There's the obvious stuff like ye old Gnarven, Liss/Kennen/Rumble top with an AD mid, or Submarine Shen with an AP assassin midlane. Is there anything particularly interesting that fits our groups playstyle?
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My point is that these sort of questions are going to foster a lot more discussion since they aren't basic "Top Lane 101" stuff. You're just approaching it from a macro-perspective where the top laner should basically be a 2nd tank-support, instead of the micro-perspective of playing Riven/Trynd/Jax/Irelia/Darius and destroying everyone.
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Continuing Gnar discussion, i do have to say that he ballsnows really hard. Mini Gnar is VERY squishy if you are behind since he's got very high base CDs until he gains levels + builds CDR. And a confident toplaner with that is ahead and has natural sustain (Irelia) can just intentionally eat your boomerangs to deny you CS.
The primary reason for his mediocre/weak win rate is not because he was overnerfed, but just that, due to team miscoordination (going in 5 seconds before MegaGnar form is ready, not being able to teleport at certain times because he's basically teemo), he'll lose 2-3% win rate compared to "always up" bruisers or tanks. Another reason why Gnarven was so good