Kade Anderson is making it look way too easy. That’s the whole problem. If he were merely good at Double-A Arkansas, people wouldn’t be clamoring for a call up so soon. We could file him away as another exciting arm in a system that seems to print them out whenever the major-league staff gets shaken up. But Anderson has been so dominant that patience feels like the front office is just being stubborn. Through his first eight starts with Arkansas, Anderson has a 1.63 ERA, a 0.80 WHIP and a 58-to-7 strikeout-to-walk ratio. He has already had nights where Double-A hitters looked completely lost at the plate. He’s ranked as Seattle’s No. 2 prospect and MLB Pipeline’s No. 1 left-handed pitching prospect, which is enough for any Mariners fan to be excited about. There are other parts to this that also make sense. The Mariners have an entirely right-handed rotation. Anderson is a polished lefty with a real starter’s mix. He was the No.…