Agreed to your comments on the form of Chandimal & Mendis.
However, the stats you’ve presented would have been much more independent (in intention) if you didn’t purposefully filter the matches on/before 17th-Oct-18 – which doesn’t capture the 56(33b) by Mendis on 23 Oct 2018 vs Eng.
[having said that, that single fifty alone cannot bring a light to his score log in recent past].