Tanak wasn't fast enough in Monte power stage then apparently had a slow puncture or something in Mexico (which explains another poor time?). Meeke hasn't exactly hampered Ott, you can say he's even helped a bit this year in Monte especially, and maybe Mexico too by taking pts from Neuville ×2 and Ogier once, just as much as you can say he's purely taking pts away from Ott. You can't sign someone like Meeke and expect him to drive at snails pace outside the top 5 in every power stage, that isnt realistic. Tanak has to take care of his own power stages (which he did in Sweden).
Meeke will play a team game later in the season I'm sure. After all, he'll want Tommi to take up that one year contract extension and supporting Tanak and Toyota is going to help with that. Jari hopefully will find some sort of speed and better results later in the season too, because strong and fast team mates can be more of a benefit to Tanak than a hindrance if managed correctly.