you can search a chpt or two ahead to if you dont find it there but 373 is titled student teacher era if you look at 369-373 for all the info on pein,nagato,konan,yahiko and pre pein fight info and how the sanin got there name.
heres the links
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Pien vs j-man
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I dont know if Versuvio archived the older manga so heres the site were i found them at this should help with any info you have on konan j-man pein yahiko nagato and the sanin