Please do not follow their advice of Craft any golden Legendaries you really want and then opening your packs. This is the opposite of what you should do. Your goal should be to get more of your top picks. Here's a simple example.
To keep the math easy, assume that there are five legendaries and you'll get one from packs and you can craft one.
If you craft first, you have a 100% chance of getting your top pick and then you have a 25% chance of getting your second pick. Which is a 25% chance of getting your top two picks.
If you open first, you have a 20% chance of getting your top pick and a 20% chance of getting your second pick. If you get your top pick, then craft your second pick. If you get your second pick, craft your first pick. Either way, you get your top two pick, which is 40% chance of getting both of your top picks.
Hope this helps.
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