
JG..... neither of those pics show a horses chin actually TOUCHING its chest.... and those horses are free to move their heads and necks up or down, in or out as they wish.... horses being subjected to rolkur do not have that choice.
In 20 years + of being around and watching horses both ridden and loose i have NEVER seen a horse touch its chest with its chin except in an attempt to relieve an itch (and even then not very often), ive certainly never seen a horse loose offer a rolkur postion, but i HAVE seen loose schooled horses (notably that when ridden DONT offer a nice round outline and 'on the bit' head carriage), carry themselves in the appropriate round soft engaged outline, with their heads on or just above the vertical....
Rolkur is inflicted on horses for extended periods of time and it does do damage to the nerves, muscles and whatever else is in the over flexed part of the horses neck/poll.
Em