I wouldnt ay he's massively predictable but just that Alex is by far the best counter puncher at LHW at the moment, maybe the best in MMA as a whole.
Really though i think Jiri knew this in the first fight which is why he kept his distance in the first round only to find that doing so would expose him to having to his legs cut from under him.
Besides perhaps trying to grapple more effectively I would argue better tactics maybe just to take the risk early on vs Alex, rush him down and hope to land something big first before his legs are beaten up.