hi r, ch h, hope all is well,in your first paragraph ive had birds throw two flights like that and as obs no prob at all, ,,,,but did have one pigeon [in 50 odd years ] that moulted strangely every year , the flights moulted out most irregular , sometimes 3 at the end or 3 at the beginning even miss one moult one miss one moult one , never ever seen this since all its parents , family were ok even its ybs and g children , so never ever got to the bottom of that one , the bird was allways shining, i asked armand scheers, he said [bird prone to false moult] but as i say never really found out yet, im not suggesting yours are like that , in fact i would say quite normal, but this one of mine seemed to be a one off,
the second one , to cut the birds flights on the one wing is what the vets do to the parrots ,[when asked] it gives the bird more freedom than being locked in asmall cage , i did that with my parrot but left it as it moulted its new flights and has now been flying free for years now, mind hes old now and doesnt go far, but as far as the pigeons go , i would prefer[ if i couldnt break them] to" soap" their flights , and once theve been out for awhile and seen round about they usualy stay, when the soap washes off, but off course youd have to have them in the bottom nest boxes, but whichever way you choose , the bird is still having more freedom , than being stuck in the loft,,,,,,anyway wish you all the best with them [ :'(sorry didnt mean to go on so long ]