All possible Avenues for filling holes?

First off I live how so many people think we have no draft this year. With Possible Comp picks it looks like we get at least 5 picks which for the way are team is put together that is enough if chosen wisely. Besides draft and Free agency I was poking around our reserve signings thus far. I few names and just physical make up interest me. I don't know much about them hopefully someone can fill me in.

Could any one of these players make the jump and contribute?

OL could Alex Parsons 6-4 300lbs or Zach Hurd 6-7 325 lbs make it to the OL?

DT could Travis Ivey 6-4 325lbs or Jamie Cumbie 6-7 290lbs replace Henderson?

At 6-4 210 could Eddie McGee replace Chaz or Housh and provide a large red zone threat?

Rashawn Jackson 6-1 240lbs FB be Cartwright and Tonga replacement? Bush 2.0?

Carl Inhenacho could he possibly be better than Ricky Brown or Blackstock? Solid Depth?

Curtis Taylor 6-2 200lbs lost behind 49ers deep safety rotation could this be a decent backup over Gio?

Like I said the physical build fits what we need but don't know much about their college play most are really young and probably Raw, but hey that's what coaches are for. If any of these can work out "S. Moore" this could relieve our draft worries and save money in FA. Don't get me wrong still would like some FA and a strong draft, just thinking of all options.