Van had no Adjuster and therefore did not fuse. He was reunited with his Adjuster after translation, but we are not told when or if he fused.
66:4.8-9 2. The one hundred were material but superhuman beings, having been reconstituted on Urantia as unique men and women of a high and special order.
This group, while enjoying provisional citizenship on Jerusem, were as yet unfused with their Thought Adjusters; and when they volunteered and were accepted for planetary service in liaison with the descending orders of sonship, their Adjusters were detached. But these Jerusemites were superhuman beings—they possessed souls of ascendant growth. During the mortal life in the flesh the soul is of embryonic estate; it is born (resurrected) in the morontia life and experiences growth through the successive morontia worlds. And the souls of the Caligastia one hundred had thus expanded through the progressive experiences of the seven mansion worlds to citizenship status on Jerusem.
67:4.5 When the staff of one hundred came to Urantia, they were temporarily detached from their Thought Adjusters. Immediately upon the arrival of the Melchizedek receivers the loyal personalities (except Van) were returned to Jerusem and were reunited with their waiting Adjusters. We know not the fate of the sixty staff rebels; their Adjusters still tarry on Jerusem. Matters will undoubtedly rest as they now are until the entire Lucifer rebellion is finally adjudicated and the fate of all participants decreed.
67:6.8 Van and Amadon remained on earth until shortly after the arrival of Adam and Eve. Some years thereafter they were translated to Jerusem, where Van was reunited with his waiting Adjuster. Van now serves in behalf of Urantia while awaiting the order to go forward on the long, long trail to Paradise perfection and the unrevealed destiny of the assembling Corps of Mortal Finality.
Others translated before Amadon and Van.
67:6.3 These Amadonites were derived from the group of 144 loyal Andonites to which Amadon belonged, and who have become known by his name. This group comprised thirty-nine men and one hundred and five women. Fifty-six of this number were of immortality status, and all (except Amadon) were translated along with the loyal members of the staff. The remainder of this noble band continued on earth to the end of their mortal days under the leadership of Van and Amadon. They were the biologic leaven which multiplied and continued to furnish leadership for the world down through the long dark ages of the postrebellion era.
We are not told if Amadon had an Adjuster; at least I can't find it if the information is there. But the term translation is not synonymous with the word fusion. One can be translated without being fused; however, one cannot be fused without being translated.