If Kenyan authorities deemed the Ark Quest Academy HiAce - which was marked "School Van" - was a vehicle intended for public service, more offences could have been committed.
Under Kenyan law, it was an offence for a non-designated person to drive a PSV, or for other people to allow such a person to drive.
"If you're running a taxi, school van, a bus, minibus, tour van - all that falls under PSV and I think all the rules apply to that uniformly about what you need to have if you're operating a PSV," said Amar Mehta, senior associate at Nairobi-based Coulson Harney law firm.
Initially, Kenyan man Christopher Mmata was falsely named as the driver in the January 16 crash. He died, as did three New Zealanders. Fellows has since apologised - and acknowledged there should not have been a driver swap - but it remains unclear who prevented Fellows being immediately identified as the driver.
Hollister-Jones said the college was investigating. "I've been saying for days the circumstances around the driver swap will be the subject of the board's inquiry." The Bethlehem College group were building and maintaining school facilities in Mahanga, roughly 375km northwest of Nairobi.
Former Bethlehem College pupil Caitlin Dickson, 19, and Tauranga couple Brian and Grace Johnston died in the accident and were farewelled last week.