To TKGS
The passage from scripture provides clear instruction for our benefit and you should humbly accept the illumination it gives, namely that God's ordering of human affiars dictates that the root of an organisation will be reflected in its integrity or otherwise. Despite your attempt to sideline the wikepedia, it is an a matter of common understanding that Franicis Schuckardt was a scandalous character. Therefore the deduction about the CMRI is clear!
But the whole situation is resolved by Vatican 1, which I posted and which you avoided commenting upon.
And what about infallible Vatican 1?
Vatican 1: session 4
Chapter 2. On the permanence of the primacy of blessed Peter in the Roman pontiffs
That which our Lord Jesus Christ, the prince of shepherds and great shepherd of the sheep, established in the blessed apostle Peter, for the continual salvation and permanent benefit of the church, must of necessity remain for ever, by Christ's authority, in the church which, founded as it is upon a rock, will stand firm until the end of time.
For no one can be in doubt, indeed it was known in every age that the holy and most blessed Peter, prince and head of the apostles, the pillar of faith and the foundation of the catholic church, received the keys of the kingdom from our lord Jesus Christ, the saviour and redeemer of the human race, and that to this day and for ever he lives and presides and exercises judgment in his successors the bishops of the holy Roman see, which he founded and consecrated with his blood.
The Holy Ghost here immediately dissolves sedevacantism - unless He made in any error in the use of the words "permanent" and "forever"! On seeing this, all sedevacantists are bound to renounce this error and recognise the conciliar Popes, who whatever one may think about what they say/write/do generally, God has not and will not permit them to promulgate ex-cathedra error.