[Freesurfer] using mris_ca_train

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Dear Freesurfer experts, I have a question, does the number of input subjects matter in using "mris_ca_train" or not? i mean does it affect the results?(maybe the more subjects, the better result) and if yes, what is an approximate number? and the second question is that if there is a way so i can check my .gcs file? for example for reading annotation files u had an m file named "read_annotation.m".it did help me alot. Generally how can i check my .gcs file and evaluate its quality? just by applying it on a subject by "mris_ca_label" ? i really appreciate you if you can help me, Kind regards, Maedeh,