I do remember that tweet, but the next week after that I've also seen him playing a lot of Greninja on stream as well funny enough. Not to mention, after Stroder beat Tweek at Nimbus, I saw Leo tweet this out:
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Does this mean what I think it means? I sure hope so. Having a super top level player dedicate time into Greninja would be very interesting to see. We've had high level players use the character in S4 for example but never anyone very deep into Top 50 PGR level. Who knows how long he would stick with the character or if he would even go all the way through with it, but I would be lying if I said I didn't find interest in the idea.
Speaking of players picking up Greninja however, I saw many tweets of players considering the idea within the past two weeks. Dath has dedicated himself to Gren/Robin and now Promaelia has dedicated himself to Gren/Chrom:
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Lots of notable players are talking about the character as of late. I've seen Seagull Joe try him out, Frozen/Odyssey/Rishi expressed interest in the character, even Light has considered making him a secondary:
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What a crazy world we live in