KNeko still plays Warc, he just played Satsuki in some random tournaments. Pretty sure he's using Warc to qualify for this year's Tougeki too, he's teamed up with Jin again.
The best Warc player imo is レオ(Leo). You can find tons of videos of him on MBHP. ツジイソス(tsujisosu), AI, and SBT are also very good.