This is a surprise from Chelsea, many don't know about this striker. I think it's natural because he doesn't play in Europe, reportedly Chelsea had to spend 20 million to recruit him. If he gets minutes to play in Chelsea main squad, it is possible that David Washington can develop even better. But to become the main striker, I think Pochettino will still entrust it to other players.
Pochettino seems to be more interested in players from Latin America, indeed there is no need to doubt the talent of young players from there, especially Brazil and Argentina.
Maybe his name is still quite foreign to our ears, but I believe that his quality will be able to help Chelsea this season. Moreover, Chelsea really needs a pure attacker who can become their goal machine this season. The presence of Deivid Washington will be the right solution for Chelsea for their front line next season.
Even Tiago Silva believes that Deivid Washington will be able to develop into a fairly aggressive striker with Chelsea and he must be able to prove it when he gets the chance in a match that will be played by Chelsea. He is still quite young and it is likely that he will have to be able to compete for a regular place under Pochettino tutelage.