You're taking things way too literal. Fizdale has only coached 1 full season, 101 games in all, with a record of 50-51. Yes, that is a losing record but I don't think anyone would view him as a losing coach because he's lost 51 out of 101 games. He brought Memphis to the playoffs last year and suffered a poor start to this season without Mike Conley and with Marc Gasol throwing him under the bus. The Grizzlies did nothing to help him win this year.
Also Steve Clifford wasn't with the Hornets for a good majority of this season, so their record this year shouldn't count against him entirely. It takes a while to turn a team around and in Clifford's 5 years with the Hornets/Bobcats he brought them to the playoffs a couple of times and had a record of 196-214. Here is a link to a story about Clifford missing time from the team this year because of health issues.
http://amicohoops.net/nba-rumors-steve-clifford-charlotte-hornets-nba-coaching/
And another article from when he was cleared to return to the bench..
https://www.cbssports.com/nba/news/...ord-cleared-to-return-following-long-absence/
You can dislike the Suns looking at either of them but they've hardly been unsuccessful. I don't like the idea of Clifford because of his health problems. We might as well keep Triano because whoever the lead assistant is will probably see a lot of time filling in for him. Here's a
link to Clifford's record and here is a
link to Fizdale, each show their time as assistants also but doesn't list the records for the teams they were with as assistants.