Visually, he was exceptional as a calf. One might add that he always has carried and transmitted the propensity to lay on external fat and that is a big reason they do look good/thick/etc. I don't specifically remember white in the back, but his feather was large and I'd bet if you looked hard you could probably find some white hairs. He had enough chrome around the edges that checking his back was required. One just knew that he would transmit "more white than ideal".
Frank was very keen on him, even as a calf. I was not as he was scurred and we were looking for bulls more likely to be homozygous polled.
If one uses 774 as a sire, white in the back is inevitable to some extent. Of course, it also depends on the cow's share of the genetics too. If a breeder's emphasis is on markings, don't use the bull.
Daugthers are typically very nice and they are without the pendulous udder issues that his sire transmitted (although 774 isn't as "wild" on MM EPD as 7002 is either). Feet can be an issue. It jumps out every once in awhile.
Like any sire, there are things to improve in the bull and things that you really like.