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5s is the most tile efficient, and doesn't really hurt the chances of iipeiko for a dama ron. A riichi for 36s after drawing 7s/9p is still fine as long as the dealer doesn't advance too much, so there's no need to get rid of the 6p now.

is what I discarded but I was really torn between that and just not keeping that . Is iipeiko that important at this point?
If I hold on to that 455, then all I need for tenpai is to draw a or the you mentioned without having to wait for that specific . I am seeing now that I can still do that and just discard that later (if I held on to it) and all I would be giving up is a draw of which there is only 1 left and If I do get that , I could then discard the . Never mind. I got it.