Regarding your advice to Bittersteel to seize Lys, Myr, Tyrosh & the Disputed Lands, don’t you think that is simply opening up a can of worms? After all, from what we know the Essossi city states don’t look kindly upon any power seizing control of multiple major cities at once( refer anti Volantis alliance in CoB). What’s stopping Bravos, Pentos, the anti Blackfyre factions of the Three Daughters & maybe even Volantis allying with the Targs & ganging up on the Company’s holdings in Essoss?

To quote HBO’s Rome, “if my last coin buys me a throne, it will have been worth it.” 

Yes, potentially I might have to deal with an Essosi alliance down the line. But the Triarchy lasted 34 years on its own, so it’s not like I don’t have time. 

And since what I’m actually after is Westeros, losing the Three Daughters after I take Westeros is an acceptable loss, but I could potentially buy off my opponents by giving them Myr and/or Lys and still be in the positive. 

Then again, if and when I’ve taken Westeros, I’ll have a lot more resources to hold onto the Three Daughters if I want to.