[{quoted}](name=Critmaster Garen,realm=NA,application-id=3ErqAdtq,discussion-id=dEswgdBt,comment-id=00010000000000010001,timestamp=2016-03-30T21:13:55.753+0000)
before you need sunfire cape, dead mans has higher priority.
No, Sunfire is a much bigger powerspike in lane and is far easier to rush. Sunfire doesn't do much damage? Deadman's Plate does considerably less. Now, this is not to imply that Sunfire is more important than Deadman's. It isn't. But Sunfire is much better to rush for a big lane powerspike against an AD laner, especially a champion like Riven, Renekton, Poppy, or Wukong. It blunts their burst while allowing you to do more damage to them at the same time. No other armour item has the best mix of early game defense and offense. Oh, and that extra wave clear is pretty important if you're against an AD champion that actually can bully you, like Quinn or Graves.
And the implication that randuin's is even near core is laughable. Sunfire isn't quite as core as Black Cleaver or Deadman's, but it's much less situational than Randuin's, which is only relevant if a crit-based champ on the enemy team is strong (note I said "crit-based" instead of "ADC", since the crit damage on champs like Graves, Quinn, Ezreal [who is also the most popular ADC btw], Kog'maw, Kalista [though the attack speed slow and active might make it worth it], and to an extent Corki [partly because Corki does largely magic damage] and Lucian is negligible). If you're against champs like Jhin, Vayne, Yasuo, Tryndamere, or Anivia (lol)? Sure, by all means get that Randuin's.
Oh, and Sterak's Gage is a little situational. The extra base AD is nice, as is the shield, but frankly? Garen is already virtually unkillable, so it's also less mandatory than it is on Darius. I pretty much always get it if I'm snowballing though.