There are, as of writing, 432 voting members in the House, 197 of whom are Republicans.
Of the total, there are 103 members on the Intelligence, Oversight or Foreign Affairs committees, all of whom are allowed to participate in the inquiry hearings. Forty-eight of them are Republicans.
In other words, 1 out of every 4 Republicans in the House can participate in the inquiry hearings anyway. That doesn't include Minority Leader Kevin McCarthy (R-Calif.), who is also allowed to participate. It does include Rep. Greg Pence (R-Ind.), the brother of the vice president. He sits on the Foreign Affairs committee.
According to a news release sent from Gaetz's office that was spotted by journalist Marcy Wheeler, 41 Republicans joined Gaetz's sit-in protest Wednesday. Of that group, more than a quarter — 13 — were members of the three relevant committees and, therefore, allowed to attend the hearings! Those 13, in fact, make up more than a quarter of all of the Republicans allowed to attend the hearings. They also included Rep. Lee Zeldin (N.Y.), who bragged during an interview on Fox News this week that he'd attended more of the hearings than Schiff.