Just like the bones, a new grouping is established. Earth orbited Mars which orbited Saturn. See this grouping/evolution stuff is pretty easy. Now this theory predicts a greater tilt beyond Saturn and by golly Neptune(28.32°) fills the bill nicely. BTW my source disagrees with the Mars value of 23.98°, it has the value as 25.19°---Mars fact sheet
Ah, but YOU chose the grouping criterion to be Axis Inclination, which is why I used the subjunctive mood when referring to it.
BTW my source disagrees with the Mars value of 23.98°, it has the value as 25.19°---Mars fact sheet
I'm relying on 30 year-old copy of Norton's; if yours is newer and authoritative, I gladly defer to it.
Upon further inspection, it appears your source provides "Obliquity to Orbit"; my source simple refers to the parameter as "Inclination of Axis." If the Inclination of Axis is measured with respect to the ecliptic instead of the Martian orbital plane, the two values should vary by the amount equal to the Inclination of the Martian orbit to the ecliptic. This value is listed as 1.85° and change, which when subtracted from your source's figure of 25.19°, yeilds a figure very close to Norton's value for "Inclination of the Axis."
In the alternative, I suppose Saturn could have swooped in on Mars while we weren't watching during the past 30 years and side-swiped it, causing the axis to change it's inclination. That would fit right in with the rest of medved's planetary weirdness.