Hopkin writes about the study section meeting: "the reviewer who gave your proposal the highest relative score presents your application." It is my understanding that two or three primary reviewers each present their reports. Scores are assigned by secret ballot after the general discussion (but before the budget discussion).
Hopkin writes there are "usually three" primary reviewers. I am under the impression that there are most commonly two (although there may, on occasion, be a third) but there are now also one or two (and sometimes apparently more) "readers" who also comment on the proposal.
Hopkin quotes one source, "use at least a 12-point font...or you may find that your application is returned for reformatting." Although a 12-point font would be kind to reviewers--as long as you follow the NIH instructions about type size (page 6 of PHS 398, Rev. 5/95, reprinted 6/96), NIH would have no grounds to return ...