Pundit
I get where you are coming from and have some sympathy but just that sympathy.
1. It is important that the ICC be taken seriously both by Member States and individual witnesses. Allowing the ICC the power to compel testimony would go along way towards ending injustices created by false witnesses and intimidation. I am sure some of the recanting witnesses believed they could con the ICC, collect a bribe from the accused and return home beyond the reach of the ICC. This ruling is a rude reminder of the reality. May be Bensouda should use it to get back Uhuru's State House meeting witness.
2. It is not unusual to have hostile witnesses in courts in murder trials around the world. The judges (and jurors in some jurisdictions) still have their power to asses the evidence, detect lies and separate fact from fiction. Today it is probably heavier on Ruto / Sang but tomorrow, it will benefit him and other accused persons. That has always been the objective even in the domestic cases;
3. On the probative value of the recanting witnesses: Was it not the position of Khan that he would like an early opportunity to expose the coaching of witnesses? Coaches he named as Mutea Iringo, Karua, Nancy Gitau etc. If he succeeds, he will prove the likelihood of a conspiracy to implicate Ruto.