How about amount BTC(poloniex), which will be loaned or in buy orders, Does the amount btc should be available in balance?
It should be the same principle as mentioned
here. So, what's on loan won't be counted, only what's on the balance. If you have a certain response from Poloniex, let us know. I hesitate to open any tickets as the response comes in weeks, but if someone has an response from them about the process, please let us know.
Only your own btc are accepting.
And Poloniex can keep some xlm for him.
The best is to have your btc in your own wallet : you're the only to have your private key and you can have all your XLM directly.