Let me quote "The Fugitive" here:
I don't care.
I am not attempting to answer the question "Would Lindgren have run faster than 28:15?". The question I'm answering is "Which mark is better?" Using any method of comparing 6-mile and 10k times (and there are plenty), Lindgren's is hands-down better.
I've been given the job of the official historian of Ohio track & field, and I have to make these kinds of conversions all the time. For example, the top end of the boys' HS 1600-meter list is as follows:
4:02.4* John Zishka Lancaster 1980
4:04.5* Ron Addison Clev. Rhodes 1972
4:05.13 Bob Kennedy Westerville North 1988
4:04.6* Jeff See Middletown 2003
4:06.0* Mason Ward unattached (Cincinatti) 2000
4:07.1* Reggie McAfee Cin. Courter Tech 1969
4:07.1* Darrell Hughes Galloway Westland 1991
4:07.7 Mike Hallabrin Mans. Malabar 1980
4:08.03 Scott Fry Sandusky Perkins 1985
4:08.2* Alan Scharsu Yng. Austintown-Fitch 1978
4:08.4* Tom Rapp Trotwood-Madison 1977
4:08.6* Todd Saul Clayton Northmont 1981
All those asterisks are conversions from a mile to 1600. They don't mean "I hate Bob Kennedy and worship John Zishka". They are merely a reasonably accurate method of combining marks from two different distances.
So while the OHSAA says the girls' 3200 meter record is 10:17.33 by Katy Radkewich, I say it's just plain stupid to ignore Ann Henderson's 10:14.0 for 2 miles.