Okasa bhante,
Vandami for your advises.
There are many monks who stayed with teacher-monks and examined to find out their teacher's level of wisdom and discipline. Yet, where they get stuck is the appearance of 'kilesa vasana'.
If they encounter any fault of a teacher monk, he will be told or though that it can be a 'kilesa vasana' of an ariya. (like ven. pilindivacca calling other monks 'vasalo', another arahant jumping across a stream ..etc.).
Other thing is the existence of the kilesas of non-arahants. If the student encounters any fault in the teacher, he can't decide the teacher as non-ariya because the ariyas have kilesas as well. So he will be confused.
Other fact is the inability of the putujjanas to identify ariyas.
So some new comers just looking for forest monasteries because they can secure at least the forest duthanga whether they will be able to find a good teacher or not.
Vandami.