I'm not clear what you are saying. No bishop can grant a declaration of nullity? I thought that's precisely what diocesan bishops did, though with their tribunal "doing all the work" and making the decision as to whether the marriage is invalid or not. Or are you referring only to SSPX bishops?
Likewise, when you say "evaluates a case and... is willing to remarry someone", do you mean an SSPX priest or bishop being told the facts of the matter regarding the marriage, ascertaining that it was invalid, and then "remarrying" one of the spouses to another partner? Or are you referring to priests and bishops in general? Traditional priests and bishops in general?
Prior to Vatican II, annulments were very rare, and it's not something the average priest (or possibly even bishop) would have ever encountered.
Yes, I meant I was told that no
traditional bishop can grant an annulment. Also, only specific, not all, diocesan bishops can grant annulment.
No traditional bishop, including the sspx bishops, are diocesan. They have no authority in canon law to have a marriage tribunal or to decide annulments.
However, due to the problems associated with the novus ordo, some traditional non-sspx priests and bishops have taken it upon themselves to decide whether or not they will re-marry someone (ipso facto granting an "annulment" by taking the burden onto themselves).
It is not an area many traditional priests or bishops will enter, for obvious reasons.