Henarar, you are such a cynic,
stirk ring at the odd 4 month old with 6 inch horns
Maybe they forgot to BCMS register on time?
EBVs have their place as long as you check the accuracy of the figures. Also be aware that previously unrecorded cattle come in well below average and it takes a while to bring them up how ever good they are so don't write off good looking cattle with low accuracy EBVs but do pass by good lookers with Low EBVs (unless it Gest Length or BWT) that have high accuracy.
I don't think it is as easy to fiddle the EBVs as you think. They are comparative within your own herd and it helps if you us more than one bull. If you want an animal to stand out then you could make it a couple of months younger than the rest but then the 200 day weights would be fantastic but the 400 and 600 not so. At some point it is going to get weighed in the market or if you are recording EMA and IMF then by the registered scanner. Pedigree breeders watch each other like hawks. I've been to an open day and half the visitors were noting tag numbers in their smart phones and checking details on the herd database!
DNA testing is already compulsory for a lot of pedigree breeders especially for bulls. Herefords do it and the penalties for mistakes are suitably harsh.
Do as you would be done by.