The Twins are going to get outbid on Snell. Kikuchi may not be "perfect" but he's good enough. He's pretty cheap in salary, won't cost a ransom in prospects to acquire and he's better than any lefthanded pitcher they have. Tanner Scott is also a good addition and his remaining salary is negligible (< $2M) but he will probably cost more in prospects than Kikuchi to provide basically the same performance.
A good lefty could mean the difference between winning and losing a playoff series. Beyond Kikuchi and Scott there really isn't much available for rentals. Andrew Chafin is not exciting and Tyler Anderson is buying high.