If the Kraken occupies more than 4 grid spaces (I couldn't tell from the screenshot), then I agree, it would be better to upgrade it to level 8 with increased stats. Otherwise, it's probably not essential.
If the Kraken occupies more than 4 grid spaces (I couldn't tell from the screenshot), then I agree, it would be better to upgrade it to level 8 with increased stats. Otherwise, it's probably not essential.