Mestis, the second-tier hockey league of Finland, hasn’t turned many of its draft-eligible players into NHLers over the years. Recent top draft picks like Patrik Laine and Jesse Puljujärvi played in the league before being selected by their respective organizations, but it was a year prior to their draft year (which they spent dominating in Liiga). Jesse Ylönen, who was picked out of Mestis at the beginning of the second round in 2018, could turn into the exception as he develops in the next couple of years.
But there could be another one as well: Patrik Puistola.