Blistered feet...
Those two smallish roots are nice little bulb roots.
Did you say those two had 4 prong tops... they seem to be too small to support a 4 prong top.
I do find roots like that around my home place. I think it is just that they are living in a less than ideal location. The soil and or sunlight is just not exactaly what they need to thrive, but they live on anyway doing the best they can.
Plants that are growing in a deep shade location, with less than ideal soil, can still be smallish 3 prongers at 30-40-50 years, with tiny bulb roots. I find them like that around my place on a regular basis.
TNhunter