Yeah, the Recon Tanto does have a really thick tip but has a hollow ground unlike the earlier indestructible Recon Tantos. As for the Bushman, I believe the first Bushman were some type of high carbon spring steel before switching to SK5. But the SK5 Bushman did seem to be pretty tough back in the day, at least until around 2015 when heat treat problems began to appear. But I do remember when CS started using SK5 in the Recon Scout and Trail Master and CS fans started to report some failures and were unhappy with the change from Carbon V. NutnFancy also broke his SK5 Recon Scout whereas his older Carbon V had no problem doing the same tasks.
I don't know what is up with SK-5, but I suspect that Japanese and Taiwanese made it/make it too hard and brittle to compete in order to compete with American Carbon V after Camillus went out of business. My guess is that Japanese steel manufacturers assured Lynn that their SK-5 would be as tough as American 1080 yet have the same edge holding as Carbon V, for instance, and he got locked into using it after spending a fortune for the tooling that is needed to mill out, shape and finish SK-5 knives. However, time has not been kind to the legacy of SK-5 in Cold Steel's line as it has with AUS8 and Carbon V.
Trust me, I want to love SK-5. I mean, it technically should be a bomb-proof steel based on its composition. But all of the failures lead me to believe it's in the heat treat. Newer buyers have become such whiners about edge retention to absurd extremes (thanks to people ignorantly reading threads about folding knife steels and not knowing it doesn't apply to survival knives) that Cold Steel may have asked their knife manufacturers to up the RC on SK-5 to the point where it has become brittle like D2.
Cold Steel has not had a good carbon steel replacement since Carbon V, so it would stand to reason that they heat treat SK-5 to give it the same edge retention as Carbon V which as mentioned makes it too brittle.
Cold Steel's AUS8A was the perfect, affordable survival knife steel that has legendary toughness and ease of sharpening to a razor's edge, but thanks to ill-founded threads here on BF and Youtube comments, the knife community SCREAMED like little children to "give them edge retention!" over toughness. That's why there are no longer any affordable, quality made AUS8 survival knives any longer. All replaced with over-hardened SK-5 because that's what they wanted, not knowing it would come back to haunt them later. Now you go on Amazon and all of these same whiners that started this are screaming at the top of their lungs why their over-hardened/higher edge knives retention failed during basic bushcraft tasks.
As the old saying, be careful what you wish for
PS- Sorry if I got into a rant, but I am just tired of all of the ignorance out there that caused so many classic, affordable knives to be killed off over the past 10 years