Diddy's Kit is just too good to be out of the top5 [especially since they didn't touch his frame data much, if they touched frame data it would be a different story] any1 that says otherwise has not played a past Smash game or just doesn't even understand how to go about placing a character on a tier list
He was Top4 in Brawl, Top5 in P:M and now Top5 Again in SmashWiiU.
An example being that he is Just like marth, unless they mess with his frame data [like they unfortunately did to marth in WiiU which angers pretty much EVERY1, let's face it marth is low tier in this game [But Top4 in Melee, Top6 in Brawl, Top8 in P:M] because of no safe airiels, but high tier in the others because of his Kit and safe airs].
Diddy has 2 Projectiles for safe zoning and an advanced metagame behind them with some diffs in all 3 games. A Command Grab with an optional Kick if grabbing seems unsafe or impossible, that also is used for recovery, with a meteor option in the air. This Game's default Up+B is like better then brawl and P:M 3.02's combined in terms of how good. The Custom Up+B is ok aswell, but i feel thats a gimmick that won't work as time/metagame progresses.
A Solid combo game and Airs, His Fair is always his bread and butter, Uair is always a slick combo move, Bair is always super safe and an amazing mixup due to its speed, Dair is Dair :3, Nair tho underused is incredible in the correct scenarios. His tilts are all solid and need to be used more, [and not just Dtilt {Which is Godlike imo}, but Utilt and occasional Ftilt to cover opponent on banana pickups]
His smashes are sub par by themselfs but with interesting uses combined with his Zoning and Combo game they are still very useful.
His Throws seem to be legit in every smash game, In brawl they were mainly good toss aways to re-setup two bananas and a peanut. In P:M You could [just like S4] Mixup between Dthrow and Uthrow for amazing results. In S4 they originally gave him the stupidest combo ever that killed significantly early in a game where doing so is usually a challenge, Now it became just like P:M where u have loads of possibilities for interesting combos out of Dthrow and Uthrow.
Diddy that can adapt to his changes and the new setups [Like ZeRo is the golden example] will see kills around 100-120 is they are on point but need to earn the setup for an Fsmash, 130-150 off Dtilt combos/Airs, 180+ if they managed to get past that zone and u are forced to upair or fair them. Not to mention the ability for Gimps Diddy has. Diddy is at least 4th best right now. Only Threats imo are Sheik/Pika Imo, the rest are tossups for the top spots, i wanna say its Pika/Sheik/Diddy in terms of potential but people are putting Sonic/Rosa/Ness/Luigi/ZSS and inserting over diddy [which i kinda understand, but honestly i still feel Diddy in the correct hands can outplay any of those characters except maybe luigi]