Clearly, up to now, we have been talking about non-scheduled performance aircraft. Transport aircraft certified under JAR 25 must be able to sustain a failure of the critical engine at any stage of flight and recover safely on the remaining engines. Without the tits and knobs this means that once you have passed Vmcg on takeoff you can continue if you have enough runway available, and when you lift off you must be over Vmca. For certification Vmca must therefore be less than 1.2Vstall, and by the time you have passed Vr and unstuck you will be flying faster than this.
The bit in bold is not quite right.
For a part 25 certified aircraft, V2 must be higher than both 1.1Vmca [25.107(b)(3)] and 1.2Vs [25.107(b)(1) - exceptions under 25.107(b)(2)]. There is no direct requirement between Vs and Vmca as a result of this.
Additionally, Vr must be greater than 1.05Vmca [25.107(e)(1)(ii)], and this is what ensures that you are above Vmca for flight.
Vmca is required to not be greater than 1.2Vs for maximum takeoff weight [25.149(c)(4)] - but there is no requirement for this to be met for all weights.