A bowler is always easy to debut, earlier than batsman... Because the bowler has the advantage of deciding where and how the ball will be in play ... A batsman need to prepare a lot to cope up with varieties of situation... If he isn't as gifted as SRT/LARA... He needs to be at certain level, before he can come and learn at this level... And if he is from BD, he needs playing experience much more. We don't have that standard of FC too... Yet we have done it with plenty of players and they are all still learning, how to survive...so no comparison with SL, IND or PAK yet...
You are using a SL bowler's example to justify a BD batsman's inclusion in the test team.